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VCS-256 - Administration of Veritas InfoScale Availability 7.1 for UNIX/Linux - Dump Information

Vendor : Veritas
Exam Code : VCS-256
Exam Name : Administration of Veritas InfoScale Availability 7.1 for UNIX/Linux
Questions and Answers : 84 Q & A
Updated On : November 9, 2018
PDF Download Mirror : VCS-256 Brain Dump
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VCS-256 Questions and Answers

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VCS-256 exam Dumps Source : Administration of Veritas InfoScale Availability 7.1 for UNIX/Linux

Test Code : VCS-256
Test Name : Administration of Veritas InfoScale Availability 7.1 for UNIX/Linux
Vendor Name : Veritas
Q&A : 84 Real Questions

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Veritas Administration of Veritas InfoScale

Elliott and Veritas group up to purchase Athenahealth for $5.5bn | killexams.com Real Questions and Pass4sure dumps

deepest equity company Veritas Capital and hedge fund Elliott management have agreed to buy US healthcare technology neighborhood Athenahealth for $5.5bn, in accordance with three individuals with talents of the deal.

The money deal, which is to be announced Monday morning, values the provider of digital healthcare record and medical billing software at $135 a share. Elliott, which owns about 9 per cent of Athenahealth, will grasp an equity stake via its Evergreen Coast Capital deepest equity arm.

Athenahealth, Veritas and Elliott declined to comment.

The buyout by using Veritas, which has some $10bn of assets below management, may be among the many greatest ever completed through the long island-primarily based group. The private fairness fund has made a string of acquisitions over the last a number of years, together with the purchase of a GE Healthcare unit in July for simply below $1.1bn.

Elliott approached Athenahealth with a $one hundred sixty-per-share offer takeover offer in may also, a year after taking a stake in the company. 

The activist fund lambasted the board for “fail[ing] to relevant a host of identifiable operational concerns”. It observed Athenahealth, which was one of the greatest winners from guidelines introduced beneath the Obama administration that required docs to stream their paper files over to computerised programs, become doomed to underperformance as a public company. 

Some analysts noted clunky know-how left the enterprise prone to competitors from superior technologies the usage of massive records and synthetic intelligence to aid guide physicians. remaining week, Athenahealth noted third-quarter salary fell in need of analyst forecasts.

Shares within the enterprise have been unstable this yr. The stock rose as excessive as $164 in the wake of the Elliott offer in might also but has given that languished. It closed at $one hundred twenty.35 on Friday, taking its decline for the 12 months to nearly 10 per cent. 

Elliott is run through Paul Singer, the activist investor whose decade-lengthy combat over defaulted bonds issued with the aid of the executive of Argentina at one point worried detaining one of the country’s navy ships whereas it became docked in a Ghanaian port.

The Athenahealth deal comes months after Jonathan Bush, a co-founding father of the enterprise, resigned after harmful revelations surrounding his personal lifestyles.

Mr Bush had been embroiled in a bitter tussle with Elliot, which changed into making an attempt in addition him out of his function as chief executive, arguing he became mismanaging the company.

Athenahealth in February named Jeff Immelt, the former chairman and chief govt of commonplace electric powered, to chair its board.

information of the bid fee changed into first mentioned through Reuters.


Veritas Enters New executive-wide Cloud statistics administration agreement for the U.S. customary services Administration | killexams.com Real Questions and Pass4sure dumps

Veritas applied sciences, the global market share chief within the commercial enterprise statistics protection and utility-described storage market, has entered into a govt-vast agreement for the U.S. usual functions Administration (GSA) to give federal companies with information governance and cloud statistics administration application.

beneath the agreement, govt agencies could have access to Veritas information coverage and cloud options at negotiated costs to allow for stronger information management. The contract is derived from the GSA IT schedule 70 and absolutely helps the Federal counsel expertise Acquisition Reform Act (FITARA) Enhancement program.

The contract brings Veritas’ award-profitable commercial enterprise records management portfolio to all eligible federal, state, local and tribal government organizations. These agencies can construct upon the statistics insurance plan foundation of Veritas NetBackup and add further statistics administration capabilities to accelerate their cloud initiatives. one of the most preliminary choices consist of:

  • Veritas facts insight helps enterprises improve unstructured information governance to in the reduction of expenses, possibility and achieve compliance via actionable intelligence into information possession, utilization and entry controls.
  • Veritas eDiscovery Platform gives governments with the most reliable analysis toolkit for isolating valuable prison, regulatory and investigative objects, revealing context and prioritising what is most critical, using a single utility.
  • Veritas InfoScale helps federal IT teams stronger give protection to counsel and applications across physical and virtual infrastructures. InfoScale minimises downtime by featuring high availability and disaster restoration over any distance for important company functions, including individual databases, custom purposes and complicated multitier applications across physical, virtual and cloud environments.
  • Veritas commercial enterprise Vault, when offered as a solution with a FedRAMP authorised utility-as-a service (SaaS) cloud provider from bluesource (called EV247), frees agencies from the overhead of possessing, operating or managing e mail and file archives. The EV247 answer is powered via the realm’s leading archiving technology from Veritas. it is a cloud platform, utility archiving answer and managed carrier multi functional.
  • Veritas 360 statistics administration gives groups the capability to radically change their statistics to handle the challenges of end-to-conclusion facts administration through facts visibility, compliance readiness, company continuity, facts insurance policy and recoverability. It accomplishes all of these intention whereas protecting statistics/workload portability and storage optimisation.
  • “The IT schedule 70 FITARA Enhancement software will provide executive organizations with enhanced flexibility in gaining access to the imaginitive utility solutions they need at an improved value to taxpayers,” observed Alan Thomas, GSA Federal Acquisition provider (FAS) Commissioner. “presenting these solutions through a executive-extensive, business-level contract is a great solution to in the reduction of duplication in our procurement procedure.”

    “With the upward push of cybercrime, the introduction of new data rules, an upturn of information boom and escalation of digital privateness, federal organizations nowadays ought to be organized to make strategic decisions round information assortment, data storage, the place of that information—and the way it can also be safeguarded,” pointed out Tom Kennedy, vp and normal manager, Veritas Public Sector. “because the undisputed leader in information insurance plan and software-described storage, Veritas is providing govt businesses handy entry to options that aid combat these pressures – to keep in mind data, keep it included, enhance statistics availability, free up the power of counsel and garner insights to drive advancements in govt classes.”

    –ENDS–

    concerning the IT time table 70 FITARA Enhancement software

    The Federal suggestions technology Acquisition Reform Act (FITARA) is a GSA program designed to make it less demanding and more low cost for federal companies to acquire application. FITARA become handed by means of Congress in 2014 and the workplace of administration and budget (OMB) carried out advice in 2016. It aims to in the reduction of charges and produce imaginitive know-how to the federal government.

    About Veritas

    Veritas technologies is the leader in the world enterprise statistics insurance policy and software-described storage market. We aid probably the most essential corporations on earth, together with 86 per cent of the international Fortune 500, again up and get well their records, retain it comfortable and purchasable, take care of towards failure and obtain regulatory compliance. As enterprises modernise their IT infrastructure, Veritas provides the technology that helps them reduce risks and capitalise on their records. learn more at www.veritas.com or follow us on Twitter at @veritastechllc.


    task Veritas sting on Krysten Sinema now not precisely a gotcha moment | killexams.com Real Questions and Pass4sure dumps

    Senate candidate Kyrsten Sinema speaks to supporters and volunteers on the Arizona Democratic birthday party Glendale workplace, Ariz. on October 28, 2018.(image: Patrick Breen/The Republic)

    A correct-wing undercover sting operation on Kyrsten Sinema didn’t flip up any video evidence of the candidate secretly rocking a pink tutu.

    as a substitute, the super sleuths over at challenge Veritas caught Arizona's Demoratic nominee for the Senate ... announcing pretty tons the identical stuff she says publicly.

    here’s Sinema, “duped” into making this (now not-so) surprising observation about undocumented immigrants:

    "I consider we should still offer citizenship to each person who's in this nation who isn’t dangerous," Sinema informed the undercover operator. "You be aware of, in case you haven’t dedicated a nasty crime, you know, then be sure to get a course to citizenship. That’s what I accept as true with."

    but Sinema is on checklist as helping complete immigration reform, including improved border security and providing undocumented immigrants a direction to citizenship provided they be taught English, pay a nice and pay returned taxes.

    The intrepid undercover operative obviously changed into hoping to trick Sinema into asserting she secretly plans to grab all the weapons if she makes it into the Senate.

    here’s the Veritas bait: "after I say ban guns in California, we’re all like, yeah, ban them, but you say ban weapons out right here?"

    "They’ll in reality shoot you,” Sinema replied.

    Which is probably going why Sinema has shown no assist for HR 5087, a invoice proposing a ban on assault weapons.

    in the undercover video, Sinema's district director, Michelle Davidson, tells the Veritas operative that Sinema "can not be speaking about an assault weapons ban" if she desires to win. as a substitute, Davidson stated, Sinema can talk about heritage assessments, the gun-exhibit loophole and making it harder for americans convicted of domestic violence to get guns. 

    several staffers and a donor speak on the undercover video about how Sinema is definitely a left winger posing as a centrist and one even looks to mock Sinema's platform, asserting “she’s going to vote for the pursuits of Arizonans. She’s going to rise up and give protection to Arizonan values. anything the f**okay that skill.”.

    I’d be greater intrigued if the video clips weren’t so closely edited. 

    And if the controversial comments came from the candidate in preference to in the main low-level staffers.

    And if left-wingers truly favored Sinema. They don’t -- and haven't for a very long time.

    They were livid, as an instance, when she turned into one in all just 25 Democrats who voted towards the Iran nuclear settlement struck by using the Obama administration in 2015.

    "This vote will actually be a heavy factor in her future campaigns,” Ilya Sheyman, executive director of MoveOn.org Political action, noted at the time. “Frankly, with this vote and the relaxation of Rep. Sinema's list, it pretty much seems like Rep. Sinema is begging to be primaried — and we should be seeking to see if a revolutionary challenger emerges."

    I doubt they preferred it any enhanced when she voted in September to make particular person tax cuts passed via everlasting.

    Now Sinema is locked right into a dead-even race in opposition t Martha McSally and Republicans are terrified that they’re about to lose a Senate seat.

    as a consequence comes task Veritas, with its undercover video “exposing the crusade’s belief that to win in Arizona, Sinema must seem greater average than she definitely is, and conceal her modern views from voters within the method.”

    Sinema, who has voted with Donald Trump sixty two p.c of the time.

    Sinema, who has spoke of this nation's determined deserve to make compromise cool once more.

    As gotcha videos go, task Veritas got here up with a huge ol’ acquired nothing.

    reach Roberts at laurie.roberts@arizonarepublic.com.

    more FROM ROBERTS:

    study or Share this story: https://www.azcentral.com/story/opinion/op-ed/laurieroberts/2018/10/30/kyrsten-sinema-challenge-veritas-sting-recording/1819838002/


    VCS-256 Administration of Veritas InfoScale Availability 7.1 for UNIX/Linux

    Study Guide Prepared by Killexams.com Veritas Dumps Experts


    Killexams.com VCS-256 Dumps and Real Questions

    100% Real Questions - Exam Pass Guarantee with High Marks - Just Memorize the Answers



    VCS-256 exam Dumps Source : Administration of Veritas InfoScale Availability 7.1 for UNIX/Linux

    Test Code : VCS-256
    Test Name : Administration of Veritas InfoScale Availability 7.1 for UNIX/Linux
    Vendor Name : Veritas
    Q&A : 84 Real Questions

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    COMPUTINGFrom...Network World Fusion networking

    January 24, 2000Web posted at: 12:11 p.m. EST (1711 GMT)

    by John Bass and James Robinson, Network World Test Alliance

    (IDG) -- It all boils down to what you're looking for in a network operating system (NOS).

    Do you want it lean and flexible so you can install it any way you please? Perhaps administration bells and management whistles are what you need so you can deploy several hundred servers. Or maybe you want an operating system that's robust enough so that you sleep like a baby at night?

    The good news is that there is a NOS waiting just for you. After the rash of recent software revisions, we took an in-depth look at four of the major NOSes on the market: Microsoft's Windows 2000 Advanced Server, Novell's NetWare 5.1, Red Hat Software's Linux 6.1 and The Santa Cruz Operation's (SCO) UnixWare 7.1.1. Sun declined our invitation to submit Solaris because the company says it's working on a new version.

    Microsoft's Windows 2000 edges out NetWare for the Network World Blue Ribbon Award. Windows 2000 tops the field with its management interface, server monitoring tools, storage management facilities and security measures.

    However, if it's performance you're after, no product came close to Novell's NetWare 5.1's numbers in our exhaustive file service and network benchmarks. With its lightning-fast engine and Novell's directory-based administration, NetWare offers a great base for an enterprise network.

    We found the latest release of Red Hat's commercial Linux bundle led the list for flexibility because its modular design lets you pare down the operating system to suit the task at hand. Additionally, you can create scripts out of multiple Linux commands to automate tasks across a distributed environment.

    While SCO's UnixWare seemed to lag behind the pack in terms of file service performance and NOS-based administration features, its scalability features make it a strong candidate for running enterprise applications.

    The numbers are in

    Regardless of the job you saddle your server with, it has to perform well at reading and writing files and sending them across the network. We designed two benchmark suites to measure each NOS in these two categories. To reflect the real world, our benchmark tests consider a wide range of server conditions.

    NetWare was the hands-down leader in our performance benchmarking, taking first place in two-thirds of the file tests and earning top billing in the network tests.

    Red Hat Linux followed NetWare in file performance overall and even outpaced the leader in file tests where the read/write loads were small. However, Linux did not perform well handling large loads - those tests in which there were more than 100 users. Under heavier user loads, Linux had a tendency to stop servicing file requests for a short period and then start up again.

    Windows 2000 demonstrated poor write performance across all our file tests. In fact, we found that its write performance was about 10% of its read performance. After consulting with both Microsoft and Client/Server Solutions, the author of the Benchmark Factory testing tool we used, we determined that the poor write performance could be due to two factors. One, which we were unable to verify, might be a possible performance problem with the SCSI driver for the hardware we used.

    More significant, though, was an issue with our test software. Benchmark Factory sends a write-through flag in each of its write requests that is supposed to cause the server to update cache, if appropriate, and then force a write to disk. When the write to disk occurs, the write call is released and the next request can be sent.

    At first glance, it appeared as if Windows 2000 was the only operating system to honor this write-through flag because its write performance was so poor. Therefore, we ran a second round of write tests with the flag turned off.

    With the flag turned off, NetWare's write performance increased by 30%. This test proved that Novell does indeed honor the write-through flag and will write to disk for each write request when that flag is set. But when the write-through flag is disabled, NetWare writes to disk in a more efficient manner by batching together contiguous blocks of data on the cache and writing all those blocks to disk at once.

    Likewise, Red Hat Linux's performance increased by 10% to 15% when the write-through flag was turned off. When we examined the Samba file system code, we found that it too honors the write-through flag. The Samba code then finds an optimum time during the read/write sequence to write to disk.

    This second round of file testing proves that Windows 2000 is dependent on its file system cache to optimize write performance. The results of the testing with the write-through flag off were much higher - as much as 20 times faster. However, Windows 2000 still fell behind both NetWare and RedHat Linux in the file write tests when the write-through flag was off.

    SCO honors the write-through flag by default, since its journaling file system is constructed to maximize data integrity by writing to disk for all write requests. The results in the write tests with the write-through flag on were very similar to the test results with the write-through flag turned off.

    For the network benchmark, we developed two tests. Our long TCP transaction test measured the bandwidth each server can sustain, while our short TCP transaction test measured each server's ability to handle large numbers of network sessions with small file transactions.

    Despite a poor showing in the file benchmark, Windows 2000 came out on top in the long TCP transaction test. Windows 2000 is the only NOS with a multithreaded IP stack, which allows it to handle network requests with multiple processors. Novell and Red Hat say they are working on integrating this capability into their products.

    NetWare and Linux also registered strong long TCP test results, coming in second and third, respectively.

    In the short TCP transaction test, NetWare came out the clear winner. Linux earned second place in spite of its lack of support for abortive TCP closes, a method by which an operating system can quickly tear down TCP connections. Our testing software, Ganymede Software's Chariot, uses abortive closes in its TCP tests.

    Moving into management

    As enterprise networks grow to require more servers and support more end users, NOS management tools become crucial elements in keeping networks under control. We looked at the management interfaces of each product and drilled down into how each handled server monitoring, client administration, file and print management, and storage management.

    We found Windows 2000 and NetWare provide equally useful management interfaces.

    Microsoft Management Console (MMC) is the glue that holds most of the Windows 2000 management functionality together. This configurable graphical user interface (GUI) lets you snap in Microsoft and third-party applets that customize its functionality. It's a two-paned interface, much like Windows Explorer, with a nested list on the left and selection details on the right. The console is easy to use and lets you configure many local server elements, including users, disks, and system settings such as time and date.

    MMC also lets you implement management policies for groups of users and computers using Active Directory, Microsoft's new directory service. From the Active Directory management tool inside MMC, you can configure users and change policies.

    The network configuration tools are found in a separate application that opens when you click on the Network Places icon on the desktop. Each network interface is listed inside this window. You can add and change protocols and configure, enable and disable interfaces from here without rebooting.

    NetWare offers several interfaces for server configuration and management. These tools offer duplicate functionality, but each is useful depending from where you are trying to manage the system. The System Console offers a number of tools for server configuration. One of the most useful is NWConfig, which lets you change start-up files, install system modules and configure the storage subsystem. NWConfig is simple, intuitive and predictable.

    ConsoleOne is a Java-based interface with a few graphical tools for managing and configuring NetWare. Third-party administration tools can plug into ConsoleOne and let you manage multiple services. We think ConsoleOne's interface is a bit unsophisticated, but it works well enough for those who must have a Windows- based manager.

    Novell also offers a Web-accessible management application called NetWare Management Portal, which lets you manage NetWare servers remotely from a browser, and NWAdmin32, a relatively simple client-side tool for administering Novell Directory Services (NDS) from a Windows 95, 98 or NT client.

    Red Hat's overall systems management interface is called LinuxConf and can run as a graphical or text-based application. The graphical interface, which resembles that of MMC, works well but has some layout issues that make it difficult to use at times. For example, when you run a setup application that takes up a lot of the screen, the system resizes the application larger than the desktop size.

    Still, you can manage pretty much anything on the server from LinuxConf, and you can use it locally or remotely over the Web or via telnet. You can configure system parameters such as network addresses; file system settings and user accounts; and set up add-on services such as Samba - which is a service that lets Windows clients get to files residing on a Linux server - and FTP and Web servers. You can apply changes without rebooting the system.

    Overall, Red Hat's interface is useful and the underlying tools are powerful and flexible, but LinuxConf lacks the polish of the other vendors' tools.

    SCO Admin is a GUI-based front end for about 50 SCO UnixWare configuration and management tools in one window. When you click on a tool, it brings up the application to manage that item in a separate window.

    Some of SCO's tools are GUI-based while others are text-based. The server required a reboot to apply many of the changes. On the plus side, you can manage multiple UnixWare servers from SCOAdmin.

    SCO also offers a useful Java-based remote administration tool called WebTop that works from your browser.

    An eye on the servers and clients

    One important administration task is monitoring the server itself. Microsoft leads the pack in how well you can keep an eye on your server's internals.

    The Windows 2000 System Monitor lets you view a real-time, running graph of system operations, such as CPU and network utilization, and memory and disk usage. We used these tools extensively to determine the effect of our benchmark tests on the operating system. Another tool called Network Monitor has a basic network packet analyzer that lets you see the types of packets coming into the server. Together, these Microsoft utilities can be used to compare performance and capacity across multiple Windows 2000 servers.

    NetWare's Monitor utility displays processor utilization, memory usage and buffer utilization on a local server. If you know what to look for, it can be a powerful tool for diagnosing bottlenecks in the system. Learning the meaning of each of the monitored parameters is a bit of a challenge, though.

    If you want to look at performance statistics across multiple servers, you can tap into Novell's Web Management Portal.

    Red Hat offers the standard Linux command-line tools for monitoring the server, such as iostat and vmstat. It has no graphical monitoring tools.

    As with any Unix operating system, you can write scripts to automate these tools across Linux servers. However, these tools are typically cryptic and require a high level of proficiency to use effectively. A suite of graphical monitoring tools would be a great addition to Red Hat's Linux distribution.

    UnixWare also offers a number of monitoring tools. System Monitor is UnixWare's simple but limited GUI for monitoring processor and memory utilization. The sar and rtpm command-line tools together list real-time system utilization of buffer, CPUs and disks. Together, these tools give you a good overall idea of the load on the server.

    Client administration

    Along with managing the server, you must manage its users. It's no surprise that the two NOSes that ship with an integrated directory service topped the field in client administration tools.

    We were able to configure user permissions via Microsoft's Active Directory and the directory administration tool in MMC. You can group users and computers into organizational units and apply policies to them.

    You can manage Novell's NDS and NetWare clients with ConsoleOne, NWAdmin or NetWare Management Portal. Each can create users, manage file space, and set permissions and rights. Additionally, NetWare ships with a five-user version of Novell's ZENworks tool, which offers desktop administration services such as hardware and software inventory, software distribution and remote control services.

    Red Hat Linux doesn't offer much in the way of client administration features. You must control local users through Unix permission configuration mechanisms.

    UnixWare is similar to Red Hat Linux in terms of client administration, but SCO provides some Windows binaries on the server to remotely set file and directory permissions from a Windows client, as well as create and change users and their settings. SCO and Red Hat offer support for the Unix-based Network Information Service (NIS). NIS is a store for network information like logon names, passwords and home directories. This integration helps with client administration.

    Handling the staples: File and print

    A NOS is nothing without the ability to share file storage and printers. Novell and Microsoft collected top honors in these areas.

    You can easily add and maintain printers in Windows 2000 using the print administration wizard, and you can add file shares using Active Directory management tools. Windows 2000 also offers Distributed File Services, which let you combine files on more than one server into a single share.

    Novell Distributed Print Services (NDPS) let you quickly incorporate printers into the network. When NDPS senses a new printer on the network, it defines a Printer Agent that runs on the printer and communicates with NDS. You then use NDS to define the policies for the new printer.

    You define NetWare file services by creating and then mounting a disk volume, which also manages volume policies.

    Red Hat includes Linux's printtool utility for setting up server-connected and networks printers. You can also use this GUI to create printcap entries to define printer access.

    Linux has a set of command-line file system configuration tools for mounting and unmounting partitions. Samba ships with the product and provides some integration for Windows clients. You can configure Samba only through a cryptic configuration ASCII file - a serious drawback.

    UnixWare provides a flexible GUI-based printer setup tool called Printer SetUp Manager. For file and volume management, SCO offers a tool called VisionFS for interoperability with Windows clients. We used VisionFS to allow our NT clients to access the UnixWare server. This service was easy to configure and use.

    Storage management

    Windows 2000 provides the best tools for storage management. Its graphical Manage Disks tool for local disk configuration includes software RAID management; you can dynamically add disks to a volume set without having to reboot the system. Additionally, a signature is written to each of the disks in an array so that they can be moved to another 2000 server without having to configure the volume on the new server. The new server recognizes the drives as members of a RAID set and adds the volume to the file system dynamically.

    NetWare's volume management tool, NWConfig, is easy to use, but it can be a little confusing to set up a RAID volume. Once we knew what we were doing, we had no problems formatting drives and creating a RAID volume. The tool looks a little primitive, but we give it high marks for functionality and ease of use.

    Red Hat Linux offers no graphical RAID configuration tools, but its command line tools made RAID configuration easy.

    To configure disks on the UnixWare server, we used the Veritas Volume Manager graphical disk and volume administration tool that ships with UnixWare. We had some problems initially getting the tool to recognize the drives so they could be formatted. We managed to work around the disk configuration problem using an assortment of command line tools, after which Volume Manager worked well.

    Security

    While we did not probe these NOSes extensively to expose any security weaknesses, we did look at what they offered in security features.

    Microsoft has made significant strides with Windows 2000 security. Windows 2000 supports Kerberos public key certificates as its primary authentication mechanism within a domain, and allows additional authentication with smart cards. Microsoft provides a Security Configuration Tool that integrates with MMC for easy management of security objects in the Active Directory Services system, and a new Encrypting File System that lets you designate volumes on which files are automatically stored using encryption.

    Novell added support for a public-key infrastructure into NetWare 5 using a public certificate schema developed by RSA Security that lets you tap into NDS to generate certificates.

    Red Hat offers a basic Kerberos authentication mechanism. With Red Hat Linux, as with most Unix operating systems, the network services can be individually controlled to increase security. Red Hat offers Pluggable Authentication Modules as a way of allowing you to set authentication policies across programs running on the server. Passwords are protected with a shadow file. Red Hat also bundles firewall and VPN services.

    UnixWare has a set of security tools called Security Manager that lets you set up varying degrees of intrusion protection across your network services, from no restriction to turning all network services off. It's a good management time saver, though you could manually modify the services to achieve the same result.

    Stability and fault tolerance

    The most feature-rich NOS is of little value if it can't keep a server up and running. Windows 2000 offers software RAID 0, 1 and 5 configurations to provide fault tolerance for onboard disk drives, and has a built-in network load-balancing feature that allows a group of servers to look like one server and share the same network name and IP address. The group decides which server will service each request. This not only distributes the network load across several servers, it also provides fault tolerance in case a server goes down. On a lesser scale, you can use Microsoft's Failover Clustering to provide basic failover services between two servers.

    As with NT 4.0, Windows 2000 provides memory protection, which means that each process runs in its own segment.

    There are also backup and restore capabilities bundled with Windows 2000.

    Novell has an add-on product for NetWare called Novell Cluster Services that allows you to cluster as many as eight servers, all managed from one location using ConsoleOne, NetWare Management Portal or NWAdmin32. But Novell presently offers no clustering products to provide load balancing for applications or file services. NetWare has an elaborate memory protection scheme to segregate the memory used for the kernel and applications, and a Storage Management Services module to provide a highly flexible backup and restore facility. Backups can be all-inclusive, cover parts of a volume or store a differential snapshot.

    Red Hat provides a load-balancing product called piranha with its Linux. This package provides TCP load balancing between servers in a cluster. There is no hard limit to the number of servers you can configure in a cluster. Red Hat Linux also provides software RAID support through command line tools, has memory protection capabilities and provides a rudimentary backup facility.

    SCO provides an optional feature to cluster several servers in a load-balancing environment with Non-Stop Clustering for a high level of fault-tolerance. Currently, Non-Stop Clustering supports six servers in a cluster. UnixWare provides software RAID support that is managed using SCO's On-Line Data Manager feature. All the standard RAID levels are supported. Computer Associates' bundled ArcServeIT 6.6 provides backup and restore capabilities. UnixWare has memory protection capabilities.

    Documentation

    Because our testing was conducted before Windows 2000's general availability ship date, we were not able to evaluate its hard-copy documentation. The online documentation provided on a CD is extensive, useful and well-organized, although a Web interface would be much easier to use if it gave more than a couple of sentences at a time for a particular help topic.

    NetWare 5 comes with two manuals: a detailed manual for installing and configuring the NOS with good explanations of concepts and features along with an overview of how to configure them, and a small spiral-bound booklet of quick start cards. Novell's online documentation is very helpful.

    Red Hat Linux comes with three manuals - an installation guide, a getting started guide and a reference manual - all of which are easy to follow.

    Despite being the most difficult product to install, UnixWare offers the best documentation. It comes with two manuals: a system handbook and a getting started guide. The system handbook is a reference for conducting the installation of the operating system. It does a good job of reflecting this painful experience. The getting started guide is well-written and well-organized. It covers many of the tools needed to configure and maintain the operating system. SCO's online documentation looks nice and is easy to follow.

    Wrapping up

    The bottom line is that these NOSes offer a wide range of characteristics and provide enterprise customers with a great deal of choice regarding how each can be used in any given corporate network.

    If you want a good, general purpose NOS that can deliver enterprise-class services with all the bells and whistles imaginable, then Windows 2000 is the strongest contender. However, for high performance, enterprise file and print services, our tests show that Novell leads the pack. If you're willing to pay a higher price for scalability and reliability, SCO UnixWare would be a safe bet. But if you need an inexpensive alternative that will give you bare-bones network services with decent performance, Red Hat Linux can certainly fit the bill.

    The choice is yours.

    Bass is the technical director and Robinson is a senior technical staff member at Centennial Networking Labs (CNL) at North Carolina State University in Raleigh. CNL focuses on performance, capacity and features of networking and server technologies and equipment.

    RELATED STORIES:

    Debate will focus on Linux vs. LinuxJanuary 20, 2000Some Windows 2000 PCs will jump the gunJanuary 19, 2000IBM throws Linux lovefestJanuary 19, 2000Corel Linux will run Windows appsJanuary 10, 2000Novell's eDirectory spans platformsNovember 16, 1999New NetWare embraces Web appsNovember 2, 1999Microsoft sets a date for Windows 2000October 28, 1999

    RELATED IDG.net STORIES:

    Fusion's Forum: Square off with the vendors over who has the best NOS(Network World Fusion)How we did it: Details of the testing(Network World Fusion)Find out the tuning parameters(Network World Fusion)Download the Config files(Network World Fusion)The Shootout results(Network World Fusion)Fusion's NOS resources(Network World Fusion)With Windows 2000, NT grows up(Network World Fusion)Fireworks expected at NOS showdown(Network World Fusion)

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    New Products | killexams.com real questions and Pass4sure dumps

    New Products

    ActiveBatch Gets Blackberry Functionality

    Administrators have long been able to receive pages when servers go down, but now they can restart servers with their pagers. Advanced Systems Concepts Inc. has added the Blackberry line of pagers to its list of clients for the ActiveBatch Job Scheduling and Management System.

    The ActiveBatch Wireless Client is a module for the management software that enables administrators to monitor systems and initiate processes from the Blackberry. ActiveBatch Job Scheduling and Management System allows users to set up calendars to initiate processes such as backups or printing, or initiate processes from remote clients.

    Ben Rosenberg, CEO of Advanced Systems, says the company chose to support the Blackberry first since it was the handheld best suited for round-the-clock monitoring. "The battery life is three weeks, and it’s always on," he says. Advanced Systems supports both the pager-sized and PDA-sized Blackberries.

    If a system sends out an SNMP signal, administrators can configure the system to send an e-mail to a Blackberry, alerting the administrator. The e-mail gives the administrator the option to initiate processes, such as rebooting a server, through the Blackberry. "With the Blackberry, e-mails are always actionable by you," Rosenberg says.

    Rosenberg sees two advantages to system management through wireless devices. First, it obviates the need to give instructions over the phone to a less experienced operator. Second, high-level administrators who travel can keep an eye on the system. "If you’re on the road, you’re able to know if something is wrong," he says. With both advantages, administrators will be better able to guarantee uptime, with less impact on their lives.

    In addition to the three levels of encryption standards on Blackberry devices, ActiveBatch provides additional security features, such as a password login to the system. This keeps random users, including thieves, from wreaking havoc on corporate systems. "Use of ActiveBatch is always secure," Rosenberg says.

    ActiveBatch can manage Windows, OpenVMS and Unix-based systems with an agent on each server. The agent sends information to a central Windows console. The software integrates with the Windows Management Instrument, which also serves as a SNMP provider. ActiveBatch provides three plug-ins for remote clients: e-mail, browser and now the Blackberry.

    Rosenberg says Advanced Systems is working to bring ActiveBatch to PocketPC handhelds. He says that although users can already use them with the browser-based system, the company will adapt the system to better meet the needs and limitations of the PocketPC platform.

    Contact: Advanced Systems Concepts Inc., www.advsyscon.com, (201) 798-6400

    SafeStone Provides iSeries Support to RSA Security

    Security management provider SafeStone Technologies plc. has added iSeries 400 features to an existing partnership with RSA Security Inc. Under the enhanced agreement, SafeStone is making RSA’s SecurID authentication tool usable on an iSeries 400 platform.

    Using its DetectIT Agent 400 interface, SafeStone is enabling two-factor authentication. Two-factor authentication requires an individual to be verified twice before access is allowed to systems.

    DetectIT is an offering designed by SafeStone to protect iSeries 400 exit points from unauthorized user access to confidential data, application and resources within an open-connectivity environment.

    Through DetectIT, RSA’s iSeries-based users will be able to leverage software solutions for auditing, data and system management, e-business security, and application and access control for single or multiple networked iSeries 400s.

    As part of its agreement with RSA, SafeStone will act as RSA’s IBM iSeries business partner, handling all sales and support responsibility for DetectIT. In this role, SafeStone, which is also an IBM partner for systems management and development, will offer DetectIT to RSA’s customers as either a standalone or fully integrated offering.

    Contact: RSA Security, Inc., www.rsa.com, (781) 301-5000

    SafeStone Technologies plc, www.safestone.com

    Vendors Make Linux Itanium-Ready

    With Intel Corp.’s May release of its 64-bit Itanium processor, Linux vendors are lining up to support the new architecture. Red Hat Inc., TurboLinux Inc., SuSE AG and Caldera International Inc. all formally released distributions for Itanium.

    To coincide with the announcement, TurboLinux released its Operating System 7 for the Itanium processor. "It’s production-ready," says Thrane Jensen, product manager for Itanium. However, Jensen admits that many users will use early Itanium machines for testing and development, rather than using them in production environments yet.

    Bill Claybrook, research director for Linux and open source at the Aberdeen Group, confirms that "most people are waiting for McKinley." He believes that users will wait for Intel to release McKinley—its second-generation IA-64 processor—before they integrate IA-64 into their environments. "They’re being a little bit leery of it [in] a production environment," he says. Jensen says TurboLinux is working on its McKinley version of Linux already.

    Jensen says that porting Linux to the IA-64 processor had its challenges. The 64-bit nature of the processor created challenging issues for moving applications over to the new chip. "Dependencies on 32-bit create problems," he says. Some applications addressed specific 32-bit features that did not exist in Itanium. For the most part, applications could be recompiled for the chip. "In general, it’s along the same code line," he says, "but the kernel has [alot of] different stuff."

    In addition to the core operating system, Jensen says many popular Linux applications are also ready for prime time. Apache and other commonly used applications are production-ready, but "ISVs are going to be doing more application development," he says.

    Red Hat released its Red Hat Linux 7.1 for the Itanium processor in mid-June. Using the 2.4 kernel, Red Hat positions the new release as a platform for testing 64-bit applications ported from 32-bit and RISC machines. The distribution is also suited to enterprise server needs; it runs on up to eight processors and offers new configuration tools for BIND, Apache and printing.

    At the same time, Linux vendor SuSE released an Itanium-specific distribution. SuSE Linux 7.2 for IA-64 uses six CD-ROMs to carry over 1,500 applications for the emerging platform. Like Red Hat, the company bills the package as a solution for evaluating and deploying Itanium-based servers.

    Although a preview version was already available from the Caldera FTP site at ftp.caldera.com/ia64, Caldera released two new versions in May, accompanied by a public announcement. The final production version of OpenLinux Server 64 should be available late in the third quarter.

    Biff Traber, senior vice president and general manager of the server business line at Caldera, says Caldera has little to lose by waiting to release a production version. Customers will look to the distribution for evaluation purposes, so a beta release meets their needs. "It’s a combination of testing, development and prototyping," he says.

    The Trillian project, which initiated development of a Linux kernel for the Itanium processor, first released a kernel in February 2000, predating Itanium’s general availability by over a year. Intel was aggressive in getting prototype chips to developers to ensure a market providing hardware, remote servers and emulators to enable open source developers to have Linux ready for the release date.

    The project later changed its name to the more formal-sounding IA-64 Linux Project and worked to further enhance the development of Linux on Itanium. Itanium is not the first 64-bit platform to run Linux—there were already flavors of Linux for Sun Microsystems Inc.’s Sparc processor and Compaq Computer Corp.’s Alpha. In addition to the distributors, the IA-64 Linux Project also boasted hardware vendors, Hewlett-Packard Co., IBM Corp., Silicon Graphics Inc., VA Linux Systems Inc. and NEC Corp., as well as Intel and Swiss research laboratory CERN.


    More About Filesystems | killexams.com real questions and Pass4sure dumps

    This chapter is from the book 

    If we consider filesystems as a mechanism for both storing and locating data, then the two key elements for any filesystem are the items being stored and the list of where those items are. The deeper details of how a given filesystem manipulates its data and meta-information go beyond the scope of this chapter but are addressed further in Appendix B, "Anatomy of a Filesystem."

    Filesystem Components That the Admin Needs to Know About

    As always, we need to get a handle on the vocabulary before we can understand how the elements of a filesystem work together. The next three sections describe the basic components with which you, as a sysadmin, need to be familiar.

    Files

    The most intuitively obvious components of a filesystem are, of course, its files. Because everything in UNIX is a file, special functions are differentiated by file type. There are fewer file types than you might imagine, as Table 3.2 shows.

    Table 3.2 File Types and Purposes, with Examples

    File Type

    Purpose/Contents

    Examples

    Directory

    Maintains information for directory structure

    /

    /usr

    /etc

    Block special

    Buffered device file

    Linux: /dev/hda1

    Solaris: /dev/dsk/c0t0d0s0

    Character special

    Raw device file

    Linux: /dev/tty0

    Solaris: /dev/rdsk/c0t0d0s0

    UNIX domain socket

    Interprocess communication (IPC)

    See output of commands for files Linux: netstat –x Solaris: netstat -f unix

    Named pipe special (FIFO device)

    First-in-first-out IPC mechanism, Invoked by name

    Linux: /dev/initctl Solaris: /etc/utmppipe/etc/cron.d/FIFO

    Symbolic link

    Pointer to another file (any type)

    /usr/tmp -> ../var/tmp

    Regular

    All other files; holds data of all other types

    Text files Object files Database files Executables/binaries

    Notice that directories are a type of file. The key is that they have a specific type of format and contents (see Appendix B for more details). A directory holds the filenames and index numbers (see the following section, "Inodes") of all its constituent files, including subdirectories.

    Directory files are not flat (or regular) files, but are indexed (like a database), so that you can still locate a file quickly when you have a large number of files in the same directory.13

    Even though file handling is generally transparent, it is important to remember that a file's data blocks14 may not be stored sequentially (or even in the same general disk region). When data blocks are widely scattered in an uncoordinated manner, it can affect access times and increase I/O overhead.

    Inodes

    Meta-information about files is stored in structures called index nodes, or inodes. Their contents vary based on the particular filesystem in use, but all inodes hold the following information about the file they index:15

  • Inode identification number

  • File type

  • Owners: user and group

  • UNIX permissions

  • File size

  • Timestamps

  • ctime: Last file status change time

  • mtime: Last data modification time16

  • atime: Last access time

  • Reference/link count

  • Physical location information for data blocks

  • Notice that the filename is not stored in the inode, but as an entry in the file's closest parent directory.

    All other information about a file that ls displays is stored in an inode somewhere. With a few handy options, you can pull out lots of useful information. Let's say that you want to know the inode number of the Solaris kernel.17 You just give the –i option, and voilá:

    [sun:10 ~]ls -i /kernel/genunix

    264206 genunix

    Of course, ls –l is an old friend, telling you most everything that you want to know. Looking at the Solaris kernel again, you get the output in Figure 3.4.

    Figure 3.4 Diagrammed Output of ls on a File

    Notice that the timestamp shown by default in a long listing is mtime. You can pass various options to ls to view ctime and atime instead. For other nifty permutations, see the ls man page.

    File Permissions and Ownership Refresher

    Because UNIX was designed to support many users, the question naturally arises how to know who can see what files. The first and simplest answer is simply to permit users to examine only their own files. This, of course, would make it difficult, if not impossible, to share, creating great difficulties in collaborative environments and causing a string of other problems: Why can't I run ls? Because the system created it, not you, is only the most obvious example of such problems.

    Users and Groups

    UNIX uses a three-part system to determine file access: There's what you, as the file owner, are allowed to do; there's what the group is allowed to do; and there's what other people are allowed to do. Let's see what Elvis's permissions look like:

    [ elvis@frogbog elvis ]$ ls -l

    total 36

    drwxr-xr-x 5 elvis users 4096 Dec 9 21:55 Desktop

    drwxr-xr-x 2 elvis users 4096 Dec 9 22:00 Mail

    -rw-r--r-- 1 elvis users 36 Dec 9 22:00 README

    -rw-r--r-- 1 elvis users 22 Dec 9 21:59 ThisFile

    drwxr-xr-x 2 elvis users 4096 Dec 12 19:57 arc

    drwxr-xr-x 2 elvis users 4096 Dec 10 00:40 songs

    -rw-r--r-- 1 elvis users 46 Dec 12 19:52 tao.txt

    -rw-r--r-- 1 elvis users 21 Dec 9 21:59 thisfile

    -rw-r--r-- 1 elvis users 45 Dec 12 19:52 west.txt

    As long as we're here, let's break down exactly what's being displayed. First, we have a 10-character string of letters and hyphens. This is the representation of permissions, which I'll break down in a minute. The second item is a number, usually a single digit. This is the number of hard links to that directory. I'll discuss this later in this chapter. The third thing is the username of the file owner, and the fourth is the name of the file's group. The fifth column is a number representing the size of the file, in bytes. The sixth contains the date and time of last modification for the file, and the final column shows the filename.

    Every user on the system has a username and a number that is associated with that user. This number generally is referred to as the UID, short for user ID. If a user has been deleted but, for some reason, his files remain, the username is replaced with that user's UID. Similarly, if a group is deleted but still owns files, the GID (group number) shows up instead of a name in the group field. There are also other circumstances in which the system can't correlate the name and the number, but these should be relatively rare occurrences.

    As a user, you can't change the owner of your files: This would open up some serious security holes on the system. Only root can chown files, but if he makes a mistake, you can now ask root to chown the files to you. As a user, you can chgrp a file to a different group of which you are a member. That is, if Elvis is a member of a group named users and a group named elvis, he can chgrp elvis west.txt or chgrp users west.txt, but because he's not a member of the group beatles, he can't chgrp beatles west.txt. A user can belong to any number of groups. Generally (although this varies somewhat by flavor), files created belong to the group to which the directory belongs. On most modern UNIX variants, the group that owns files is whatever group is listed as your primary group by the system in the /etc/passwd file and can be changed via the newgrp command. On these systems, Elvis can chgrp users if he wants his files to belong to the users group, or he can chgrp elvis if he wants his files to belong to the elvis group.

    Reading Permissions

    So, what were those funny strings of letters and hyphens at the beginning of each long directory listing? I already said that they represented the permissions of the file, but that's not especially helpful. The 10 characters of that string represent the permission bits for each file. The first character is separate, and the last nine are three very similar groups of three characters. I'll explain each of these in turn.

    If you look back to Elvis's long listing of his directory, you'll see that most of the files simply have a hyphen as the first character, whereas several possess a d in this field. The more astute reader might note that the files with a d in that first field all happen to be directories. There's a good reason for this: The first permissions character denotes whether that file is a special file of one sort or another.

    What's a special file? It's either something that isn't really a file (in the sense of a sequential stream of bytes on a disk) but that UNIX treats as a file, such as a disk or a video display, or something that is really a file but that is treated differently. A directory, by necessity, is a stream of bytes on disk, but that d means that it's treated differently.

    The next three characters represent what the user who owns the file can do with it. From left to right, these permissions are read, write, and execute. Read permission is just that—the capability to see the contents of a file. Write permission implies not only the right to change the contents of a file, but also the right to delete it. If I do not possess write permission to a file, rm not_ permitted.txt fails.

    Execute permission determines whether the file is also a command that can be run on the system. Because UNIX sees everything as a file, all commands are stored in files that can be created, modified, and deleted like any other file. The computer then needs a way to tell what can and can't be run. The execute bit does this.

    Another important reason that you need to worry about whether a file is executable is that some programs are designed to be run only by the system administrator: These programs can modify the computer's configuration or can be dangerous in some other way. Because UNIX enables you to specify permissions for the owner, the group, and other users, the execute bit enables the administrator to restrict the use of dangerous programs.

    Directories treat the execute permission differently. If a directory does not have execute permissions, that user (or group, or other users on the system) can't cd into that directory and can't look at information about the files in that directory. (You usually can find the names of the files, however.) Even if you have permissions for the files in that directory, you generally can't look at them. (This varies somewhat by platform.)

    The second set of three characters is the group permissions (read, write, and execute, in that order), and the final set of three characters is what other users on the system are permitted to do with that file. Because of security concerns (either due to other users on your system or due to pervasive networks such as the Internet), giving write access to other users is highly discouraged.

    Changing Permissions

    Great, you can now read the permissions in the directory listing, but what can you do with them? Let's say that Elvis wants to make his directory readable only by himself. He can chmod go-rwx ~/songs: That means remove the read, write, and execute permissions for the group and others on the system. If Elvis decides to let Nashville artists take a look at his material but not change it (and if there's a group nashville on the system), he can first chgrp nashville songs and then chmod g+r songs.

    If Elvis does this, however, he'll find that (at least, on some platforms) members of group nashville can't look at them. Oops! With a simple chmod g+x songs, the problem is solved:

    [ elvis@frogbog elvis ]$ ls -l

    total 36

    drwxr-xr-x 5 elvis users 4096 Dec 9 21:55 Desktop

    drwxr-xr-x 2 elvis users 4096 Dec 9 22:00 Mail

    -rw-r--r-- 1 elvis users 36 Dec 9 22:00 README

    -rw-r--r-- 1 elvis users 22 Dec 9 21:59 ThisFile

    drwxr-xr-x 2 elvis users 4096 Dec 12 19:57 arc

    drwxr-x--- 2 elvis nashvill 4096 Dec 15 14:21 songs

    -rw-r--r-- 1 elvis users 46 Dec 12 19:52 tao.txt

    -rw-r--r-- 1 elvis users 21 Dec 9 21:59 thisfile

    -rw-r--r-- 1 elvis users 45 Dec 12 19:52 west.txt

    Special Permissions

    In addition to the read, write, and execute bits, there exists special permissions used by the system to determine how and when to suspend the normal permission rules. Any thorough understanding of UNIX requires an understanding of the setuid, setgid, and sticky bits. For normal system users, only a general understanding of these is necessary, and this discussion is thus brief. Good documentation on this subject exists elsewhere for budding system administrators and programmers.

    setuid

    The setuid bit applies only to executable files and directories. In the case of executable programs, it means that the given program runs as though the file owner were running it. That is, xhextris, a variant on Tetris, has the following permissions on my system:

    -rwsr-xr-x

    1 games games 32516 May 18 1999 /usr/X11R6/bin/xhextris

    There's a pseudouser called games on the system, which can't be logged into and has no home directory. When the xhextris program executes, it can read and write to files that only the game's pseudouser normally would be permitted. In this case, there's a high-score file stored on the system that writeable only by that user. When Elvis runs the game, the system acts as though he were the user games, and thus he is able to store the high-score file. To set the setuid bit on a file, you can tell chmod to give it mode u+s. (You can think of this as uid set, although this isn't technically accurate.)

    setgid

    The setgid bit, which stands for "set group id," works almost identically to setuid, except that the system acts as though the user's group is that of the given file. If xhextris had used setgid games instead of setuid games, the high score would be writeable to any directory owned by the group games. It is used by the system administrator in ways fundamentally similar to the setuid permission.

    When applied to directories on Linux, Irix, and Solaris (and probably most other POSIX-compliant UNIX flavors as well), the setgid bit means that new files are given the parent directory's group rather than the user's primary or current group. This can be useful for, say, a directory for fonts built by (and for) a given program. Any user might generate the fonts via a setgid command that writes to a setgid directory. setgid on directories varies by platform; check your documentation. To set the setgid bit, you can tell chmod to use g+s (gid set).

    sticky

    Although a file in a group or world-writeable directory without the sticky bit can be deleted by anyone with write permission for that directory (user, group, or other), a file in a directory with the sticky bit set can be deleted only by either the file's owner or root. This is particularly useful for creating temporary directories or scratch space that can be used by anyone without one's files being deleted by others. You can set permission +t in chmod to give something the sticky bit.

    Numeric Permissions

    Like almost everything else on UNIX, permissions have a number associated with them. It's generally considered that permissions are a group of four digits, each between 0 and 7. Each of those digits represents a group of three permissions, each of which is a yes/no answer. From left to right, those digits represent special permissions, user permissions, group permissions, and other permissions.

    So, About Those Permission Bits...

    Most programs reading permission bits expect four digits, although often only three are given. Shorter numbers are filled in with leading zeros: 222 is treated as 0222, and 5 is treated as 0005. The three rightmost digits are, as previously mentioned, user (owner) permissions, group permissions, and other permissions, from right to left.

    Each of these digits is calculated in the following manner: read permission has a value of 4, write permission has a value of 2, and execute permission has a value of 1. Simply add these values together, and you've got that permission value. Read, write, and execute would be 7, read and write without execute would be 6, and no permission to do anything would be 0. Read, write, and execute for the file owner, with read and execute for the group and nothing at all for anyone else, would be 750. Read and write for the user and group, but only read for others, would be 664.

    The special permissions are 4 for setuid, 2 for setgid, and 1 for sticky. This digit is prepended to the three-digit numeric permission: A temporary directory with sticky read, write, and execute permission for everyone would be mode 1777. A setuid root directory writeable by nobody else would be 4700. You can use chmod to set numeric permissions directly, as in chmod 1777 /tmp.

    umask

    In addition to a more precise use of chmod, numeric permissions are used with the umask command, which sets the default permissions. More precisely, it "masks" the default permissions: The umask value is subtracted from the maximum possible settings.* umask deals only with the three-digit permission, not the full-fledged four-digit value. A umask of 002 or 022 is most commonly the default. 022, subtracted from 777, is 755: read, write, and execute for the user, and read and execute for the group and others. 002 from 777 is 775: read, write, and execute for the user and group, and read and execute for others. I tend to set my umask to 077: read, write, and execute for myself, and nothing for my group or others. (Of course, when working on a group project, I set my umask to 007: My group and I can read, write, or execute anything, but others can't do anything with our files.)

    You should note that the umask assumes that the execute bit on the file will be set. All umasks are subtracted from 777 rather than 666, and those extra ones are subtracted later, if necessary. (See Appendix B for more details on permission bits and umask workings.)

    *Actually, the permission bits are XORed with the maximum possible settings, if you're a computer science type.

    Also notice that the first bit of output prepended to the permissions string indicates the file type. This is one handy way of identifying a file's type. Another is the file command, as shown in Table 3.3.

    Table 3.3 ls File Types and file Output Sample

    File Type

    ls File Type Character

    File Display Example

    Directory

    d

    [either:1 ~]file /usr/usr: directory

    Block special device

    b

    [linux: 10 ~] file /dev/hda1/dev/hda1: block special (3/1)[sun:10 root ~]file /dev/dsk/c0t0d0s0/dev/dsk/c0t0d0s0: block special(136/0)

    Character special device

    c

    [linux:11 ~] file /dev/tty0/dev/tty0: character special (4/0)

    [ensis:11 ~]file /dev/rdsk/c0t0d0s0/dev/rdsk/c0t0d0s0: character special (136/0)

    UNIX domain socket

    s

    [linux:12 ~] file /dev/log/dev/log: socket

    [sun:12 ~]file /dev/ccv/dev/ccv: socket

    Named pipe special (FIFO device)

    p

    [linux:13 ~] file /dev/initctl/dev/initctl: fifo (named pipe)

    [sun:13 ~]file /etc/utmppipe/etc/utmppipe: fifo

    Symbolic link

    l

    [linux:14 ~] file /usr/tmp/usr/tmp: symbolic link to ../var/tmp

    [sun:14 ~]file -h /usr/tmp/usr/tmp: symbolic link to ¬../var/tmp

    Regular

    -

    [linux:15 ~] file /etc/passwd/etc/passwd: ASCII text

    [linux:15 ~] file /boot/vmlinux-2.4.2-2/boot/vmlinux-2.4.2-2: ELF 32-bit LSB executable,

    ¬Intel 80386, version 1,statically linked, not stripped

    [linux:15 ~] file /etc/rc.d/init.d/sshd/etc/rc.d/init.d/sshd: Bourne-Again shell script text executable

    [sun:15 ~]file /etc/passwd

    /etc/passwd: ascii text

    [sun:15 ~]file /kernel/genunix

    -/kernel/genunix: ELF 32-bit MSB relocatable

    ¬SPARC Version 1

    [sun:15 ~]file /etc/init.d/sshd

    /etc/init.d/sshd: executable

    ¬/sbin/sh script

    Notice the in-depth information that file gives—in many cases, it shows details about the file that no other command will readily display (such as what kind of executable the file is). These low-level details are beyond the scope of our discussion, but the man page has more information.

    Important Points about the file ommand

    file tries to figure out what type a file is based on three types of test:

  • The file type that the ls –l command returns.

  • -The presence of a magic number at the beginning of the file identifying the file type. These numbers are defined in the file /usr/share/magic in Red Hat Linux 7.1 and /usr/lib/locale/locale/LC_MESSAGES/magic (or /etc/magic) in Solaris 8. Typically, only binary files will have magic numbers.

  • -In the case of a regular/text file, the first few bytes are tested to determine the type of text representation and then to determine whether the file has a recognized purpose, such as C code or a Perl script.

  • file actually opens the file and changes the atime in the inode.

    Inode lists are maintained by the filesystem itself, including which ones are free for use. Inode allocation and manipulation is all transparent to both sysadmins and users.

    Inodes become significant at two times for the sysadmin: at filesystem creation time and when the filesystem runs out of free inodes. At filesystem creation time, the total number of inodes for the filesystem is allocated. Although they are not in use, space is set aside for them. You cannot add any more inodes to a filesystem after it has been created. When you run out of inodes, you must either free some up (by deleting or moving files) or migrate to another, larger filesystem.

    Without inodes, files are just a random assortment of ones and zeros on the disk. There is no guarantee that the file will be stored sequentially within a sector or track, so without an inode to point the way to the data blocks, the file is lost. In fact, every file is uniquely identified by the combination of its filesystem name and inode number.

    See Appendix B for more detailed information on the exact content of inodes and their structure.

    Linux has a very useful command called stat that dumps the contents of an inode in a tidy format:

    [linux:9 ~]stat . File: "." Size: 16384 Filetype: Directory Mode: (0755/drwxr-xr-x) Uid: (19529/ robin) Gid:(20/users) Device: 0,4 Inode: 153288707 Links: 78 Access: Sun Jul 22 13:58:29 2001(00009.04:37:59) Modify: Sun Jul 22 13:58:29 2001(00009.04:37:59) Change: Sun Jul 22 13:58:29 2001(00009.04:37:59) Boot Block and Superblock

    When a filesystem is created, two structures are automatically created, whether they are immediately used or not. The first is called the boot block, where boot-time information is stored. Because a partition may be made bootable at will, this structure needs to be available at all times.

    The other structure, of more interest here, is the superblock. Just as an inode contains meta-information about a file, a superblock contains metainformation about a filesystem. Some of the more critical contents are listed here:18

  • Filesystem name

  • Filesystem size

  • Timestamp: last update

  • Superblock state flag

  • Filesystem state flag: clean, stable, active

  • Number of free blocks

  • List of free blocks

  • Pointer to next free block

  • Size of inode list

  • Number of free inodes

  • List of free inodes

  • Pointer to next free inode

  • Lock fields for free blocks and inodes

  • Summary data block

  • And you thought inodes were complex.

    The superblock keeps track of free file blocks and free inodes so that the filesystem can store new files. Without these lists and pointers, a long, sequential search would have to be performed to find free space every time a file was created.

    In much the same way that files without inodes are lost, filesystems without intact superblocks are inaccessible. That's why there is a superblock state flag—to indicate whether the superblock was properly and completely updated before the disk (or system) was last taken offline. If it was not, then a consistency check must be performed for the whole filesystem and the results stored back in the superblock.

    Again, more detailed information about the superblock and its role in UNIX filesystems may be found in Appendix B.

    Filesystem Types

    Both Red Hat and Solaris recognize a multitude of different filesystem types, although you will generally end up using and supporting just a few. There are three standard types of filesystem—local, network, and pseudo—and a fourth "super-filesystem" type that is actually losing ground, given the size of modern disks.

    Local Filesystems

    Local filesystems are common to every system that has its own local disk.19 Although there are many instances of this type of filesystem, they are all designed to work within a system, managing the components discussed in the last section and interfacing with the physical drive(s).

    Only a few local filesystems are specifically designed to be cross-platform (and sometimes even cross–OS-type). They come in handy, though, when you have a nondisk hardware failure; you can just take the disk and put it into another machine to retrieve the data.20 The UNIX File System, or ufs, was designed for this; both Solaris and Red Hat Linux machines can use disks with this filesystem. Note that Solaris uses ufs filesystems by default. Red Hat's default local filesystem is ext2.

    Another local, cross-platform filesystem is ISO9660, the CD-ROM standard. This is why you can read your Solaris CD in a Red Hat box's reader.

    Local filesystems come in two related but distinct flavors. The original, standard model filesystem is still in broad use today. The newer journaling filesystem type is just beginning to really come into its own. The major difference between the two types is the way they track changes and do integrity checks.

    Standard Filesystems

    Standard, nonjournaling filesystems rely on flags in the superblock for consistency regulation. If the superblock flag is not set to "clean," then the filesystem knows that it was not shut down properly: not all write buffers were flushed to disk, and so on. Inconsistency in a filesystem means that allocated inodes could be overwritten; free inodes could be counted as in use—in short, rampant file corruption, mass hysteria.

    But there is a filesystem integrity checker to save the day: fsck. This command is usually invoked automatically at boot-time to verify that all filesystems are clean and stable. If the / or /usr filesystems are inconsistent, the system might prompt you to start up a miniroot shell and manually run fsck. A few of the more critical items checked and corrected are listed here:

  • Unclaimed blocks and inodes (not in free list or in use)

  • Unreferenced but allocated blocks and inodes

  • Multiply claimed blocks and inodes

  • Bad inode formats

  • Bad directory formats

  • Bad free block or inode list formats

  • Incorrect free block or inode counts

  • Superblock counts and flags

  • Note that a filesystem should be unmounted before running fsck (see the later section "Administering Local Filesystems"). Running fsck on a mounted filesystem might cause a system panic and crash, or it might simply refuse to run at all. It's also best, though not required, that you run fsck on the raw device, when possible. See the man page for more details and options.

    So where does fsck put orphans, the blocks and inodes that are clearly in use but aren't referenced anywhere? Enter the lost+found directories. There is always a /lost+found directory on every system; other directories accrue them as fsck finds orphans in their purview. fsck automatically creates the directories as needed and renames the lost blocks into there by inode number. See the man pages "mklost+found" on Red Hat and "fsck_ufs" on Solaris.

    Journaling Filesystems

    Journaling filesystems do away with fsck and its concomitant superblock structures. All filesystem state information is internally tracked and monitored, in much the same way that databases systems set up checkpoints and self-verifications.

    With journaling filesystems, you have a better chance of full data recovery in the event of a system crash. Even unsaved data in buffers can be recovered thanks to the internal log.21 This kind of fault tolerance makes journaling filesystems useful in high- availability environments.

    The drawback, of course, is that when a filesystem like this gets corrupted somehow, it presents major difficulties for recovery. Most journaling filesystems provide their own salvaging programs for use in case of emergency. This underscores how critical backups are, no matter what kind of filesystem software you've invested in. See Chapter 16, "Backups," for more information.

    One of the earliest journaling filesystems is still a commercial venture: VxFS by Veritas. Another pioneer has decided to release its software into the public domain under GPL22 licensing: JFS23 by IBM. SGI's xfs journaling filesystem has been freely available under GPL since about 1999, although it is only designed to work under IRIX and Linux.24

    Maintenance of filesystem state incurs an overhead when using journaling filesystems. As a result, these filesystems perform suboptimally for small filesystem sizes. Generally, journaling filesystems are appropriate for filesystem sizes of 500Mb or more.

    Network Filesystems

    Network-based filesystems are really add-ons to local filesystems because the file server must have the actual data stored in one of its own local filesystems.25 Network file- systems have both a server and client program.

    The server usually runs as a daemon on the system that is sharing disk space. The server's local filesystems are unaffected by this extra process. In fact, the daemon generally only puts a few messages in the syslog and is otherwise only visible through ps.

    The system that wants to access the server's disk space runs the client program to mount the shared filesystems across the network. The client program handles all the I/O so that the network filesystem behaves just a like a local filesystem toward the client machine.

    The old standby for network-based filesystems is the Network File System (NFS). The NFS standard is currently up to revision 3, though there are quite a number of implementations with their own version numbers. Both Red Hat and Solaris come standard with NFS client and server packages. For more details on the inner workings and configuration of NFS, see Chapter 13, "File Sharing."

    Other network-based filesystems include AFS (IBM's Andrew File System) and DFS/DCE (Distributed File System, part of the Open Group's Distributed Computing Environment). The mechanisms of these advanced filesystems go beyond the scope of this book, although their goal is still the same: to efficiently share files across the network transparently to the user.

    Pseudo Filesystems

    Pseudofilesystems are an interesting development in that they are not actually related to disk-based partitions. They are instead purely logical constructs that represent information and meta-information in a hierarchical structure. Because of this structure and because they can be manipulated with the mount command, they are still referred to as filesystems.

    The best example of pseudofilesystems exists on both Red Hat and Solaris systems: /proc. Under Solaris, /proc is restricted to just managing process information:

    [sun:1 ~]ls /proc 0 145 162 195 206 230 262 265 272 286 299 303 342 370 403 408 _672 752 1 155 185 198 214 243 263 266 278 292 3 318 360 371 404 52 _674 142 157 192 2 224 252 264 268 280 298 302 319 364 400 406 58 _678

    Note that these directories are all named according to the process numbers corresponding to what you would find in the output of ps. The contents of each directory are the various meta-information that the system needs to manage the process.

    Under Red Hat, /proc provides information about processes as well as about various system components and statistics:

    [linux:1 ~] ls /proc 1 18767 23156 24484 25567 28163 4 493 674 8453 ksyms _stat 13557 18933 23157 24486 25600 3 405 5 675 9833 loadavg _swaps 13560 18934 23158 24487 25602 3050 418 5037 676 9834 locks _sys 13561 18937 23180 24512 25603 3051 427 5038 7386 9835 mdstat _tty 1647 19709 23902 24541 25771 3052 441 5054 7387 bus meminfo _uptime 1648 19730 23903 24775 25772 30709 455 5082 7388 cmdline misc _version 1649 19732 23936 25494 25773 30710 473 510 7414 cpuinfo modules 16553 19733 24118 25503 25824 30712 485 5101 7636 devices mounts 18658 2 24119 25504 25882 30729 486 524 7637 dma mtrr 18660 21450 24120 25527 25920 320 487 558 7638 filesystems net 18661 21462 24144 25533 26070 335 488 6 7662 fs _partitions 18684 21866 24274 25534 26071 337 489 670 8426 interrupts pci 18685 21869 24276 25541 26072 338 490 671 8427 ioports scsi 18686 21870 24277 25542 28161 339 491 672 8428 kcore self 18691 21954 24458 25543 28162 365 492 673 8429 kmsg slabinfo

    Again we see the directories named for process numbers, but we also see directories with indicative names such as cpuinfo and loadavg. Because this is a hierarchical filesystem, you can cd into these directories and read the various files for their system information.

    The most interesting thing about /proc is that it allows even processes to be treated like files.26 This means that pretty much everything in UNIX, whether it is something that just exists or something that actually happens, can now be considered a file.

    For more information under Red Hat, type man proc. For more information under Solaris, type man –s 4 proc.

    Logical Volumes

    Finally, there are the "super-filesystems" or logical volumes that do what the other major types of filesystem cannot: surmount the barriers of partitions. You may well ask why anyone would want to do that. There are two reasons. First, because disks used to be a lot smaller and more costly, you used what you had at hand. If you needed a large pool of disk space, logical volumes allowed you to aggregate remnants into something useable. Second, even with larger disks, you still might not be able to achieve the kind of disk space required by a particular researcher or program. Once again, logical volumes allow you to aggregate partitions across disks to form one large filesystem.

    Crossing disk boundaries with a logical volume is referred to as disk spanning. Once you have logical volumes, you can also have some fairly complex data management methods and performance-enhancing techniques. Disk striping, for example, is a performance booster. Instead of sequentially filling one disk and then the next in series, it spreads the data in discrete chunks across disks, allowing better I/O response through parallel operations.

    RAID27 implements logical volumes at 10 distinct levels, with various features at each level. This implementation can be done either in hardware or in software, although the nomenclature for both is the same.28

    Table 3.4 RAID Levels

    RAID Level

    Features

    Implications

    0

    Disk striping

    Fastest

    Not self-repairing

    1

    Disk mirroring

    Fast

    Self-repairing

    -Requires extra drives for data duplication

    2

    Disk striping

    Fast

    Error correction

    Self-repairing

    (Very similar to RAID-3)

    3

    Disk striping

    Slower

    Parity disk

    Self-repairing

    Error correction

    Requires separate parity disk

    4

    Disk striping

    Slower

    Parity disk

    Self-repairing

    Requires separate parity disk

    (Very similar to RAID-5)

    5

    Disk striping

    Slowest for writes, but

    Rotating parity array

    good for reads

    Self-repairing

    Requires three to five separate parity disks

    Reconstruction by parity data (not duplication)

    6

    RAID-5 + secondary

    Not in broad use

    parity scheme

    7

    RAID-5 + real-time embedded controller

    Not in broad use

    0+1

    Mirrored striping

    -RAID-0 array duplicated (mirrored)

    1+0

    Striped mirroring

    -Each stripe is RAID-1 (mirrored) array

    High cost

    0+3

    Array of parity stripes

    Each stripe is RAID-3 array

    High cost

    Clearly, the kind of complexity inherent in all logical volume systems requires some kind of back-end management system. Red Hat offers the Logical Volume Manager (LVM) as a kernel module. While the details of LVM are beyond the scope of this book, it is interesting to note that you can put any filesystem that you want on top of the logical volume. Start at http://www.linuxdoc.org/HOWTO/LVM-HOWTO.htmlfor more details.

    Although Sun offers logical volume management, it is through a for-pay program called "Solstice DiskSuite." The filesystem on DiskSuite logical volumes must be ufs. For more information, start at http://docs.sun.com/ab2/coll.260.2/DISKSUITEREF.

    Another commercial logical volume manager for Solaris comes from Veritas; see: http://www.veritas.com/us/products/volumemanager/faq.html#a24

    The beauty of all logical volumes is that they appear to be just another local filesystem and are completely transparent to the user. However, logical volumes do add some complexity for the systems administrator, and the schema should be carefully documented on paper, in case it needs to be re-created.

    NAS

    Normally, a file server's disks are directly attached to the file server. With network-attached storage (NAS), the file server and the disks that it serves are separate entities, communicating over the local network. The storage disks require an aggregate controller that arbitrates file I/O requests from the external server(s). The server(s) and the aggregate controller each have distinct network IP addresses. To serve the files to clients, a file (or application) server sends file I/O requests to the NAS aggregate controller and relays the results back to client systems.

    NAS is touched on here for completeness—entire books can be written about NAS design and implementation. NAS does not really represent a type of filesystem, but rather it is a mechanism to relieve the file server from the details of hardware disk access by isolating them in the network-attached storage unit.

    Red Hat Filesystem Reference Table

    Table 3.5 lists major filesystems that currently support (or are supported by) Red Hat.29 The filesystem types that are currently natively supported are listed in /usr/src/linux/ fs/filesytems.c.

    Table 3.5 Filesystem Types and Purposes, with Examples (Red Hat)

    Filesystem Type

    Specific Instances (as Used in /etc/fstab)

    Purpose

    Local

    ext2

    Red Hat default filesystem

    ufs

    Solaris compatibility

    jfs

    Journaling filesystem from IBM

    xfs

    Journaling filesystem from SGI

    msdos

    Windows compatibility: DOS

    ntfs

    Windows compatibility: NT

    vfat

    Windows compatibility: FAT-32

    sysv

    SYS-V compatibility

    iso9660

    CD-ROM

    Adfs hfs romfs

    Others

    Affs hpfs smbfs

    Coda mnix udf

    devpts ncpfs umsdos

    efs qux4

    coherent

    Deprecated, pre-kernel 2.1.21

    ext

    xenix

    xiafs

    Network

    afs

    Network-based remote communication

    autofs

    nfs

    Pseudo

    proc

    Store process (and other system) meta-information

    Solaris Filesystem Reference Table

    Table 3.6 lists major filesystems that currently support (or are supported by) Solaris. The filesystem types that currently are natively supported are listed as directories under /usr/lib/fs.

    Table 3.6 Filesystem Types and Purposes, with Examples (Solaris)

    Filesystem Type

    Specific Instances (as Used in /etc/vfstab)

    Purpose

    Local

    ufs

    Solaris default filesystem; Red Hat-compatible

    pcfs

    PC filesystem

    hsfs

    CD-ROM

    jfs

    Journaling filesystem from IBM

    Network

    afs

    Network-based remote communication

    nfs

    Pseudo

    procfs

    Store process metainformation

    Fdfs swapfs tmpfs

    Mount metainformation areas as filesystems

    mntfs cachefs lofs

    fifofs specfs udfs namefs



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