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310-345 - Sun Certified System Administrator for Sun Cluster 3.2 - Dump Information

Vendor : SUN
Exam Code : 310-345
Exam Name : Sun Certified System Administrator for Sun Cluster 3.2
Questions and Answers : 310 Q & A
Updated On : November 12, 2018
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310-345 Questions and Answers

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310-345 Sun Certified System Administrator for Sun Cluster 3.2

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310-345 exam Dumps Source : Sun Certified System Administrator for Sun Cluster 3.2

Test Code : 310-345
Test Name : Sun Certified System Administrator for Sun Cluster 3.2
Vendor Name : SUN
Q&A : 310 Real Questions

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Renesas Electronics Sub-Gigahertz wireless solution chosen as typical verify bed Unit for Wi-sun FAN | killexams.com Real Questions and Pass4sure dumps

via Ken Briodagh November 07, 2018

in line with a recent announcement, Wi-sun Alliance has adopted the Renesas Electronics organization, a enterprise of superior semiconductor solutions, sub-gigahertz (Sub-G) wireless answer as a candidate of the interoperability verify mattress instruments (TBUs) for the Wi-sun FAN (container enviornment community) Certification application.

Renesas is part of the first wave of businesses participating in the Wi-sun FAN 1.0 certification system with its RAA604S00/RX651 wireless solution. Certifications are planned with the aid of the conclusion of 2018.

The Sub-G wireless solution facets Tessera know-how’s comparison platform, which comprises an comparison board3 installed with Renesas’ RAA604S00 wireless communications system-on-chip (SoC) and RX651 microcontroller (MCU), as well as conversation control software provided by using Renesas. Renesas will display the brand new Sub-G instant answer at its booth (stand B.c44) at European Utility Week 2018, November 6 to November 8, in Vienna, Austria.

“The Wi-solar neighborhood has been making giant strides in the building and deployment of instant communications in the power management systems industry, and we're comfortable to expand our dedication to the wise power markets and develop the latest Wi-solar requisites with our Wi-sun FAN-licensed answer and look at various mattress contraptions,” mentioned Akihiro Kuroda, VP, power Infrastructure business Division, Renesas Electronics organisation.

The Sub-G band presents points that are resilient to actual limitations and might transmit information even extra than supported via prior requirements, even in urban environments. considering that extensive areas may also be covered with decent stability via mesh networks, it's applicable for functions such sensible meter communique, vigour usage visualization, monitoring gadget utilization, and managing a variety of sensors inside a utility, factories and buildings.

The IoT Evolution Expo, and collocated events, IoT Evolution health, LPWAN Expo, The smart metropolis event, and IIoT convention, will take place Jan. 29 to Feb 1 in ft. Lauderdale, Florida. talk over with IoTEvolutionExpo.com to register now.

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Renesas is part of 1st wave of checking out for Wi-solar FAN 1.0 certification | killexams.com Real Questions and Pass4sure dumps

07 November 2018

Wi-solar Alliance has adopted Renesas Electronics' sub-gigahertz (Sub-G) wireless solution as a candidate of the interoperability look at various bed devices (TBUs) for the Wi-sun FAN (field area network) Certification application.

Renesas is a component of the primary wave of corporations participating in the Wi-sun FAN 1.0 certification manner with its RAA604S00/RX651 wireless answer. Certifications are planned with the aid of the conclusion of 2018.

The Sub-G wireless answer facets Tessera technology’s evaluation platform, which includes an contrast board set up with Renesas’ RAA604S00 wireless communications equipment-on-chip (SoC) and RX651 microcontroller (MCU), as well as conversation control application offered by way of Renesas.

“The Wi-solar neighborhood has been making gigantic strides within the construction and deployment of instant communications in the energy management techniques industry, and we're glad to expand our commitment to the sensible power markets and develop the newest Wi-solar necessities with our Wi-sun FAN-licensed solution and check bed devices,” stated Akihiro Kuroda, vice chairman, energy Infrastructure company Division, Renesas Electronics organisation.

clients who improve wise meters, smart illumination, infrastructure device, and equivalent products the usage of the Renesas Sub-G wireless answer can be able to easily assure interoperability between device that uses the Wi-solar FAN specification. subsequently, they may be in a position to reduce their development duration for Wi-solar FAN-compliant application equipment by way of about twelve months in comparison with option options.

The Sub-G band offers features that are resilient to actual boundaries and may transmit records even additional than supported by earlier standards, even in urban environments. due to the fact that large areas can also be lined with respectable stability via mesh networks, it is appropriate for purposes such wise meter communique, energy usage visualisation, monitoring equipment utilisation, and managing numerous sensors inside a utility, factories and constructions.

author Bethan Grylls


310-345 Sun Certified System Administrator for Sun Cluster 3.2

Study Guide Prepared by Killexams.com SUN Dumps Experts


Killexams.com 310-345 Dumps and Real Questions

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



310-345 exam Dumps Source : Sun Certified System Administrator for Sun Cluster 3.2

Test Code : 310-345
Test Name : Sun Certified System Administrator for Sun Cluster 3.2
Vendor Name : SUN
Q&A : 310 Real Questions

310-345 examination prep were given to be this easy.
hey gentlemen I handed my 310-345 examination using killexams.com brain unload observe guide in handiest 20 days of readiness. The dumps absolutely changed my lifestyles once I shelling out them. presently im worked in a first ratebusiness enterprise with a decent income. way to killexams.com and the whole group of the trutrainers. tough topics are efficiently secured by them. Likewise they provide excellent reference thats beneficial for the look at purpose. I solved almost all questions in just 225 minutes.


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i am very happy right now. You ought to be questioning why im so glad, properly the purpose is quite easy, I just got my 310-345 take a look at results and ive made it through them quite without problems. I write over here because it become this killexams.com that taught me for 310-345 check and i cant go on with out thanking it for being so generous and helpful to me at some point of.


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Sun Certified System Administrator for Sun Cluster 3.2

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Anatomy of a Java Finalizer | killexams.com real questions and Pass4sure dumps

A couple of patterns that could cause Java heap exhaustion were identified from years of research at IBM. One interesting scenario was observed when Java applications generated an excessive amount of finalizable objects whose classes had non-trivial Java finalizers.

What Is a Java Finalizer?A Java finalizer performs finalization tasks for an object. It's the opposite of a Java constructor, which creates and initializes an instance of a Java class. A Java finalizer can be used to perform postmortem cleanup tasks on an instance of a class or to release system resources such as file descriptors or network socket connections when an object is no longer needed and those resources have to be released for other objects. You don't need any argument or any return value for a finalizer. Unfortunately the current Java language specification does not define any finalizers for a Java class or interface when a class or interface is unloaded. Let's take a closer look at finalize() method of java.lang.Object that provides an instance method, finalize() for finalization:

protected void finalize() throws Throwable

When a Java object is no longer needed, the space occupied by the object is supposed to be recycled automatically by the Java garbage collector. This is one of the significant differences in Java and is not found in most structural programming languages like C. If an instance of a class implements the finalize() method, its space cannot be recycled by the garbage collector in a timely fashion. Worst case, it may not be recycled at all.

Any instances of classes that implement the finalize() method are often called finalizable objects. They will not be immediately reclaimed by the Java garbage collector when they are no longer referenced. Instead, the Java garbage collector appends the objects to a special queue for the finalization process. Usually it's performed by a special thread called a "Reference Handler" on some Java Virtual Machines. During this finalization process, the "Finalizer" thread will execute each finalize() method of the objects. Only after successful completion of the finalize() method will an object be handed over for Java garbage collection to get its space reclaimed by "future" garbage collection. I did not say "current," which means at least two garbage collection cycles are required to reclaim the finalizable object. Sounds like it has some overhead? You got it. We need several shots to get the space recycled.

Finalizer threads are not given maximum priorities on systems. If a "Finalizer" thread cannot keep up with the rate at which higher priority threads cause finalizable objects to be queued, the finalizer queue will keep growing and cause the Java heap to fill up. Eventually the Java heap will get exhausted and a java.lang.OutOfMemoryError will be thrown.

A Java Virtual Machine will never invoke the finalize() method more than once for any object. If there's any exception thrown by the finalize() method, the finalization of the object is halted.

You are free to do virtually anything in the finalize() method of your class. When you do that, please do not expect the memory space occupied by each and every object to be reclaimed by the Java garbage collector when the object is no longer referenced or no longer needed. Why? It is not guaranteed that the finalize() method will complete the execution in timely manner. Worst case, it may not be even invoked even when there are no more references to the object. That means it's not guaranteed that any objects that have a finalize() method are garbage collected. That's a potential hazard from a memory management perspective and, needless to say, there is considerable overhead for queuing, dequeuing, running the finalize() method, and rescanning the object in the next garbage collection cycle.

If you want to run cleanup tasks on objects, consider finalizers as a last resort and implement your own cleanup method, which will be more predictable. It's very risky to rely on finalizers for postmortem cleanup tasks, especially if your finalizable objects have references to native resources.

Hands-on Experience with Java FinalizerWe can easily simulate this scenario with a couple of test applications and take a look at dumps and traces to see what's happening inside of the Java heap and threads for hands-on experience.

Let's build a couple of Java classes to recreate typical scenarios.

In ObjectWYieldFinalizer, we can implement the method finalize() with Thread.yield() so that finalize() cannot complete its execution (see Listing 1) (Listings 1-7 can be downloaded here.)

The Thread.yield() method prevents the currently executing thread from running and allows other threads to execute. If the Finalizer thread calls this finalize() method, it will pause its execution.

In ObjectWExceptionFinalizer, the finalizer() method immediately throws a java.lang.IndexOutOfBoundsException. If the Finalizer thread calls this finalize() method, the object finalization won't be completed because of the exception and there's no second chance to run the finalize() method (see Listing 2).

In ObjectWEmptyFinalizer, we don't implement any code in the finalize() method (see Listing 3). ObjectWOFinalizer doesn't have any finalize() method (see Listing 4).

Let's run each of the classes to see what happens. Sun's Java Virtual Machine (JVM) can be used with the following options for the class TestObjectWYieldFinalizer.

/sun1.6.0_10/bin/java -Xmx50m -verbosegc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC -XX:+HeapDumpOnOutOfMemoryError TestObjectWYieldFinalizer > verbosegc.txt

It looks very complicated. Why do we need those command-line options? Well, without those options, we only get a little information about Java garbage collection activities like this:

[Full GC 50815K->45644K(50816K), 0.2276940 secs][Full GC 48780K->46415K(50816K), 0.2233279 secs][Full GC 49551K->49551K(50816K), 0.2396315 secs][Full GC 50815K->50815K(50816K), 0.1886312 secs][Full GC 50815K->49219K(50816K), 0.1964926 secs][Full GC 50815K->50815K(50816K), 0.1865343 secs][Full GC 50815K->50815K(50816K), 0.1836961 secs]

We only get a type of garbage collection (Full GC), total Java heap usage before garbage collection (50,815K), total Java heap usage after garbage collection (45,644K), a high watermark of total Java heap (50,816K), and time spent in the garbage collection (0.2276940 secs).

High watermark is the size of the current Java heap. The Java heap can expand its size up to a maximum size or contract to manage Java heap effectively.

The -XX:+PrintGCDetails option lets the JVM provide information on each generation in the Java heap.

We can see Java heap usage and the time (in seconds) spent in Java garbage collection of each new generation, tenured generation, and permanent generation with the -XX:+PrintGCDetails option in the following example:

[GC [DefNew: 3520K->3520K(3520K), 0.0001143 secs][Tenured: 43897K->47295K(47296K), 0.2110999 secs] 47417K->47415K(50816K), [Perm : 17K->17K(12288K)], 0.2115593 secs][Times: user=0.22 sys=0.00, real=0.22 secs]

In tenured generation, Java heap usage was 43,897KB before this Java garbage collection. Java heap usage reached 47,295KB after Java garbage collection; 47296K is the size of the high watermark of the tenured generation; 0.2110999 second was spent to collect the tenured generation. Unfortunately we do not see the maximum size of each generation with the -XX:+PrintGCDetails option alone.

With -XX:+PrintGCTimeStamps, we can get a timestamp for each garbage collection like this:

1.393: [GC 1002K->106K(5056K), 0.0001036 secs]

This garbage collection started 1.393 seconds after the JVM started.

The -XX:+PrintHeapAtGC option provides extensive information about each Java garbage collection (see Listing 5).

We can even see the address range of each generation. Unfortunately there's no timestamp for each garbage collection with -XX:+PrintHeapAtGC option alone.

The last option, -XX:-HeapDumpOnOutOfMemoryError allows the JVM to dump the Java heap to a file when an allocation from the Java heap cannot be satisfied or a java.lang.OutOfMemoryError is thrown. This option was introduced in Sun Java 1.4.2 update 12 and Sun Java 5.0 update 7.

If you want to experiment with IBM's Java Virtual Machine, all you need is a -verbosegc command-line option. You do not need any of these: -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC, or -XX:+HeapDumpOnOutOfMemoryError.

Let's take a look at what happened to the class while we talked about Sun JVM's command-line option. We've got java.lang.OutOfMemoryError from TestObjectWYieldFinalizer:

Exception in the thread "main" java.lang.OutOfMemoryError: Java heap spaceat java.lang.ref.Finalizer.register(Finalizer.java:72)at java.lang.Object.<init>(Object.java:20)at ObjectWYieldFinalizer.<init>(ObjectWYieldFinalizer.java:2)at TestObjectWYieldFinalizer.main(TestObjectWYieldFinalizer.java:11)

"java.lang.OutOfMemoryError: Java heap space." That means we got Java heap space exhaustion. The JVM could not allocate any more Java heap while running the method java.lang.ref.Finalizer.register(), which is on line 72 of Finalizer.java. Finalizer.java? Of course, we did not write Finalizer.java. That's a part of the JVM. We can also check verbosegc.txt to which we redirected the garbage collection trace (see Listing 6).

About 3.711 seconds after the JVM started, we got java.lang.OutOfMemoryError. The Java heap dump is written to pid124.hprof.

Analysis of Java Garbage Collection TracesWe can use a tool to analyze this trace. The IBM Pattern Modeling and Analysis Tool for Java Garbage Collector (PMAT) is one of top five technologies at alphaWorks. I have implemented patented algorithms to predict future failures related to Java heap exhaustion in this tool. Please refer to United States Patent No. 7,475,214 if you are interested in the algorithms. Although we don't need these algorithms to investigate simple problem like this, you might be able to find situations where you could get some insight from fortune tellers. We can get a copy of the tool here.

PMAT parses verbose garbage collection (GC) trace, analyzes Java heap usage, and recommends possible solutions based on pattern modeling of Java heap usage.

The following features are included:

  • GC analysis
  • GC table view
  • Allocation failure summary
  • GC usage summary
  • GC duration summary
  • GC graph view
  • GC pattern analysis
  • Zoom in/out/selection/center of chart view
  • The tool can also parse Sun's Java garbage collector traces, including the following:

  • Serial collector
  • Throughput/parallel collector
  • Concurrent collector
  • Incremental/train collector
  • We can start version 3.2 of the tool with a jar file in the download package. (V3.2 was the latest version when this article was written.)

    # /usr/java5/bin/java -Xmx200m -jar ga32.jar

    The tool provides a headless mode but let's bring up the graphical user interface mode for easy demonstration. We can click on the "N" icon to open Sun's trace file. We can click on "I" for IBM's trace file as seen in Figure 1.

    We can see in Figure 2 the analysis result and recommendation virtually instantly.


    New Names for Sun Certifications Under Oracle | killexams.com real questions and Pass4sure dumps

    Written by GoCertify Staff Published: 01 September 2010

    With the merger of Sun certifications into the Oracle certification program, ailment all Sun certifications for Java, Solaris, MySQL, and Open Office have been renamed under the Oracle brand.

    On September 1, 2010, Oracle integrated the existing certifications from Sun Microsystems' certification program into the Oracle Certifed Professional program as part of the acquisition of Sun by Oracle. Each Sun certification was renamed to reflect the new Oracle branding, as mapped out below. The content of the related exams and scoring were not changed.

    Jump to: Java | Solaris | MySQL | OpenOffice

    Java Certifications

    Original Sun Name New Oracle Name Sun Certified Java Associate Oracle Certified Associate, Java SE 5/SE 6 Sun Certified Java Programmer (SCJP) SE 5 Oracle Certified Professional, Java SE 5 Programmer Sun Certified Java Programmer (SCJP) SE 6 Oracle Certified Professional, Java SE 6 Programmer Sun Certified Java Developer (SCJD) Oracle Certified Master, Java SE6 Developer Sun Certified Web Component Developer (SCWCD) EE5 Oracle Certified Professional, Java EE 5 Web Component Developer Sun Certified Business Component Developer (SCBCD) EE5 Oracle Certified Professional, Java EE 5 Business Component Developer Sun Certified Developer for Java Web Services 5 (SCDJWS) Oracle Certified Professional, Java EE 5 Web Services Developer Sun Certified Enterprise Architect (SCEA) EE5 Oracle Certified Master, Java EE 5 Enterprise Architect Sun Certified Mobile Application Developer (SCMAD) Oracle Certified Professional, Java ME 1 Mobile Application Developer Sun Certified JSP and Servlet Developer for the Java EE6 Platform Oracle Certified Professional, Java Platform, Enterprise Edition 6 JavaServer Pages and Servlet Developer Sun Certified EJB Developer for the Java EE6 Platform Oracle Certified Professional, Java Platform, Enterprise Edition 6 Enterprise JavaBeans Developer Sun Certified JPA Developer for the Java EE6 Platform Oracle Certified Professional, Java Platform, Enterprise Edition 6 Java Persistence API Developer Sun Certified Developer for the Java Web Services for the Java EE6 Oracle Certified Professional, Java Platform, Enterprise Edition 6 Web Services Developer Sun Certified Developer for the JSF for the Java EE6 Platform Oracle Certified Professional, Java Platform, Enterprise Edition 6 JavaServer Faces Developer Sun Certified Specialist for NetBeans IDE Oracle Certified Expert, NetBeans Integrated Development Environment 6.1 Programmer Sun Certified Integrator for Identity Manager 7.1 This certification was retired by Oracle Sun Certified Java CAPS Integrator This certification was retired by Oracle  

    Solaris Certifications

    Original Sun Name New Oracle Name Sun Certified Solaris Associate (SCSAS) Oracle Certified Associate, Oracle Solaris 10 Operating System Sun Certified System Administrator (SCSA) for Solaris OS 10 Oracle Certified Professional, Oracle Solaris 10 System Administrator Sun Certified Network Administrator (SCNA) for Solaris OS 10 Oracle Certified Expert, Oracle Solaris 10 Network Administrator Sun Certified Security Administrator (SCSECA) for Solaris OS 10 Oracle Certified Expert, Oracle Solaris 10 Security Administrator

    MySQL Certifications

    Original Sun Name New Oracle Name Sun Certified MySQL 5.0 Database Administrator (SCMDBA) Oracle Certified Professional, MySQL 5.0 Database Administrator Sun Certified MySQL 5.0 Developer (SCMDEV) Oracle Certified Professional, MySQL 5.0 Developer Sun Certified MySQL Associate (SCMA) Oracle Certified Associate, MySQL 5.0/5.1/5.5 Sun Certified MySQL 5.1 Cluster Database Administrator (SCMCDBA) Oracle Certified Expert, MySQL 5.1 Cluster Database Administrator

    OpenOffice Certifications

    Original Sun Name New Oracle Name Sun Certified OpenOffice.org Calc Specialist Oracle Certified Expert, OpenOffice.org Calc Sun Certified OpenOffice.org Impress Specialist Oracle Certified Expert, OpenOffice.org Impress Sun Certified OpenOffice.org Writer Specialist Oracle Certified Expert, OpenOffice.org Writer

    The individual exams have been renamed as well, following the same naming scheme. A pdf version of this list that includes the exam names is available on Oracle's blog.


    Phases of the Patch Management Process | killexams.com real questions and Pass4sure dumps

    Like this article? We recommend 

    This article separates a comprehensive patch management strategy into seven phases as shown in FIGURE 1 and discussed below.

    Figure 1FIGURE 1 Fig 1. High-Level Patch Management Process

    Phase 1—Identify and categorize the different types of compute services in your compute environment into three distinct categories; mission critical, business critical, and business operational.

    Phase 2—Develop a rollout scheme for each of the three environment categories (mission critical, business critical, and business operational).

    Phase 3—Create the patch clusters for the each type of environment based on the rollout method selected.

    Phase 4—Plan the patch rollout so that the proper records are maintained, and identify the most appropriate contingency plan (patch back-out plan).

    Phase 5—Obtain change management approval and notify other departments.

    Phase 6—Execute the patch cluster rollout.

    Phase 7—Perform ongoing patch monitoring and maintenance.

    Refer to the patch management flow chart at the end of this article for an illustration of the kinds of decisions you make as you move through these phases.

    Phase 1: Categorizing Your Compute Services

    Your compute environment is probably comprised of different types of compute services. This includes a set of systems supplying mission critical services, business critical services and business operational services. You might have all or a subset of these environments. It is helpful to think in terms of the service-level requirements for reliability, availability, serviceability, scalability, security, performance, and so on. Prioritize your compute services based on functional business requirements.

    The first step in the patch management process is to identify how critical the service is. The selection of patches, the rollout strategy and execution, all vary based on the prioritization of the compute environment services. For example, in a mission critical environment, system security is a high priority because a break-in can result in a compromised system that can cripple a business, either through reduced service or worse, intentional data theft or corruption. In this example, security is a critical factor and security patches need to be added to the list of patches in the patch cluster (new security patches come out every month as new ways of intrusions by hackers are discovered).

    The following three broad compute environment categories are used throughout this article:

  • Mission critical environment—an environment in which even one hour of downtime will have a significant impact on the business service, and availability is required at almost any price.

  • Business critical environment—an environment in which business services require continuous availability, but breaks in service for short periods of time are not catastrophic.

  • Business operational environment—an environment in which breaks in services are not catastrophic.

  • Mission Critical Environment

    A mission critical environment typically has the following sub environments (FIGURE 2):

  • Development environment for developing applications that will eventually be moved into production.

  • Test environment for unit test of applications.

  • Integration environment in which several application units are integrated and tested together. The integration environment is also often used for endurance testing, failure testing, and load testing of applications after applying Solaris patches.

  • Preproduction environment for final testing. The preproduction environment often closely resembles the production environment and is used for final testing in an environment that has most of the variables found in the actual production environment. In some cases, the integration environment is also used as the preproduction environment.

  • Figure 02FIGURE 2 Sub Environments in a Mission Critical Environment

    After moving through all these environments, the application (whole application or additional features or bug fixes) is promoted to the production environment.

    Among the sub environments, only the production environment is actually mission critical. This can vary depending on whether each one of these sub environments are physically separated. In many data centers, the sub environments are located physically on the same system, but have a logical separation through logical domains or other virtual machine techniques.

    Business Critical Environment

    A business critical environment might not be as strictly controlled as a mission critical environment and might only have one test environment for all types of testing. FIGURE 3 shows a typical business critical environment.

    Figure 03FIGURE 3 Sub Environments in a Business Critical Environment

    Business Operational Environment

    A business operational environment might have a loosely controlled production environment. Testing is typically done in the development environment and applications are promoted directly to the production environment. FIGURE 4 shows a typical business operational environment.

    Figure 04FIGURE 4 Sub Environments in a Business Operational Environment

    Categorize Your Compute Services Into Environment Pools

    For each service or application, determine the environment type and categorize each into various pools as shown in FIGURE 5.

    Figure 05FIGURE 5 Environment Pools

    For each application or service in each environment pool, all systems associated with the application (including the application servers, web servers, database servers, middleware servers, and so on), are placed in the same environment pool, and all of them have the same criticality level. For example, a fictitious company called Fortune 526, categorizes three of their environments into three pools as follows:

    Mission Critical

    Business Critical

    Business Operational

    Fortune 526 identified their e-commerce services as the mission critical component of their compute services because this environment is used to sell the company's products and services online. If this environment is not available even for a few minutes, the impact is very high, including loss of revenue and customer satisfaction.

    All systems that support the following e-commerce services are placed in the mission critical pool:

    The SAP environment is used by Fortune 526 for internal employee payroll. If this environment is not available for an hour or less, payroll processing will be delayed, but the company will not experience great revenue loss.

    All systems that support the SAP applications are placed in the business critical pool:

  • SAP application servers

  • SAP database servers

  • Fortune 526's customer resource management (CRM) environment is used for sales forecasts and reporting. This environment is required to accurately predict revenue, but if it is down for a small period of time, the company will not lose revenue.

    All systems that support the CRM applications are placed in the business operational pool:

    Phase 2: Developing a Patch Rollout Scheme

    In any IT environment, changes are initiated from many areas. A pending patch rollout is one of those areas where a change is initiated. In the standard change management process, your first task is to filter and prioritize the incoming requests based on potential importance and complexity. If a change is deemed urgent, the urgent change process is initiated that facilitates a quick solution, but also increases the risk of failure. The standard change process handles any other change request.

    Phase 2 outlines a patch rollout scheme for each type of environment pool, taking into account the need for quick solutions (emergency rollouts) to those environments that can follow the standard change process (rapid and regularly scheduled rollouts).

    Schemes for Mission Critical Environments

    In a mission critical environment, the patch rollout scheme can be classified into the following three categories:

    In the case of patch management, you should integrate the regularly scheduled rollout scheme into your standard change process. The rapid rollout scheme and emergency rollout schemes for patches should be special cases of the urgent change process within the context of your change management process.

    Regularly Scheduled Rollout Scheme

    Use the regularly scheduled rollout scheme (FIGURE 6) as the normal mode of operation for applying patches in a mission critical environment. The following steps define this scheme:

  • The first step is to analyze the available patches at the SunSolve Onlinesm program1 and create a patch cluster customized to your mission critical environment. Perform this analysis on a monthly basis to ensure that your mission critical services are as up-to-date as possible.

  • In the first month, apply the patch cluster to a development environment. This provides the opportunity to test the patch cluster on systems in which developers are developing code that will eventually be promoted to the production environment. If problems are encountered, software developers can correct the problems or you can coordinate with Sun to resolve any problems2.

  • In the second month, roll the patch cluster into the test (integration test) environment. This provides for testing of the patches with software that will soon be moving into the production environment.

  • In the third month, roll the patch cluster into the preproduction environment. Use this environment for endurance, stress, and regression testing, inducing heavy loads on the systems that are equivalent to the mix of loads that will be generated in the actual production environment. In addition, conduct failure testing to determine if high availability features (such as redundant networking) are working properly.

  • At end of the third month, roll the patch cluster into the production environment.

  • Rapid Rollout Scheme

    Use the rapid rollout scheme (FIGURE 6) when a lead system administrator has identified a known problem that requires a few patches to be added fairly quickly. A good example is a situation in which a system administrator has been notified by a security administrator about a CERT advisory that describes a recent attack into a Solaris system. The system administrator uses the patch analysis tools available from the SunSolve Online program to determine that a patch has been released that fixes this security hole. This process can be used also to add a feature to a system that is critical to the business service and that cannot wait for more than a month.

    Figure 06FIGURE 6 Rollout Schemes for a Mission Critical Environment

    In this process, the identified patches are first rolled into a test environment, tested for 15 days or so, and then rolled into the preproduction environment and stress and regression tested for 15 more days, and finally rolled into the production environment. This scheme moves the patches into the environment sooner than the regular rollout scheme, but still gives them a total of one month for endurance testing the patches before moving the patches into production.

    NOTE

    For some e-business applications, fixing a security hole might warrant using the emergency rollout scheme discussed in the next section.

    Emergency Rollout Scheme

    Use the emergency rollout scheme (FIGURE 6) in highly critical situations that require application of one or two patches immediately. Typically, this is a situation in which a mission critical system has a serious problem, and after analysis, it is found that one or two patches exist that would fix the problem. Care should be taken to apply only those patches that are directly relevant to fixing the current problem. This opportunity should not be used to apply other patches, otherwise you introduce more unknown entities into the environment, further complicating a challenging situation, and it won't be clear which patch actually resolved the problem. Consistently following the regularly scheduled rollout scheme ensures that emergency patching situations occur rarely.

    In this process, the senior system administrator or architect determines, with the help of Sun, what patches are required to immediately rectify the problem. Sometimes, this can be a temporary patch, also called a T-patch or a patch found in the Sun Alert list3. Once the patches are determined, they are carefully applied to the preproduction environment, tested in that environment at least for a few hours, then an urgent maintenance window is scheduled, and the patch is applied to the production environment. Care should be taken to create a well-tested back-out scheme before applying these patches to the production environment.

    Schemes for Business Critical Environments

    The patch rollout schemes (FIGURE 7) for the business critical environment is similar to the schemes used in mission critical environments. Use the three rollout schemes; regularly scheduled, rapid, and emergency rollout schemes. But you might choose to skip testing in two environments, and instead opt to test only once in the integration environment as part of the regularly scheduled rollout process. In addition, for the rapid rollouts, you can opt to cut down the testing time to 15 days per environment. For the emergency rollout scheme, testing for just a few hours in the integration environment before rolling into production might suffice.

    Figure 07FIGURE 7 Rollout Schemes for Business Critical Environments

    Schemes for Business Operational Environments

    A business operational environment may not require specific rollout schemes for regularly scheduled, rapid, and emergency rollouts. If no problems were found after applying the patch cluster to the development or test environment, the patch cluster can be rolled into production. Some companies have a higher availability for business operational environments and might opt to treat their business operational environments like business critical environments and follow the strategies outlined in the previous business critical section.

    Plan to test the patch cluster by installing it in a development environment (test for a few hours), and apply the patch cluster to your production environment.

    Phase 3: Creating a Custom Patch Cluster

    Phase 3 is complex, but becomes simpler with practice. Effective use of the tools that are available in Sun's Patch Portal from the SunSolve Online program is essential.

    The following table summarizes the tools that you can use to create a patch cluster customized for your target environments. More information about each tool is available from the Patch Portal at http://sunsolve.sun.com.

    TABLE 1 Patch Management Tools

    Patch Management Tools

    Description

    PatchCheck4

    Performs a basic analysis of a system. Generates an HTML report of all installed patches and compares it with a cross-reference file that has a list of all current patches, including recommended and security patches. From the resulting data, you can create a patch suite that can be downloaded.

    Patch Finder

    Search for a particular patch from the SunSolve patch database. Use the Patch Finder to display a specific patch description.

    PatchPro

    Analyzes and generates a custom patch list for your system.

    Signed patches

    Verifies that a patch is from Sun. Using signed patches is a secure method of applying patches because they include a digital signature that can be verified.

    Solaris_ Patch Manager Tool

    Provides configuration-specific patch analysis, automated patch downloads, patch dependency resolution, and patch installation. The Solaris Patch Manager Tool requires Perl version 5.0 at a minimum.

    Sun alert patches

    Temporary patches for recently discovered problems. These patches are part of the SunSolve EarlyNotifiersm Service.

    Sun™ Explorer software

    Collects system data. Run the Sun Explorer software tool on your system to create an output file that is a snapshot of your system configuration. Send the Sun Explorer software output to Sun and request a list of missing patches.

    Sun Root CA certificate

    SUNWcert package used to verify the digital signatures in Signed Patches.

    Based on service level requirements, some mission critical environments require a manual selection of patches to create a custom patch cluster. The more critical your environment, the more selective you should be in building your patch cluster. Some situations require application of one patch at a time, and avoiding application of a whole patch cluster in one single run. This article assumes that your senior system administrator and the senior system architect have the expertise to use the patch management tools to come up with a customized patch cluster for your target production environment. Some things to consider are as follows:

  • Consider the Solaris Jumbo Kernel Patch

    This patch is one of the most critical patches that you should consider as a patch candidate. Often times the version of this patch is reported in the output of the uname -a command. Review the README for this patch to see if this patch has important fixes and updates for the platform that you are using. For example, if most of the updates in the latest jumbo patch have fixes for the Sun Fire 15K system, and your environment does not have any Sun Fire 15K systems, then you might not want to apply this patch. However, you might consider this patch anyway to satisfy support issues with Sun (for example, Sun Service might require the installation of the latest Solaris Jumbo Kernel patch in order to support your Sun systems).

  • Investigate Sun Alert Patches

    Review the README files for the latest Sunsm Alert patches to see if any of the problems or fixes are applicable to the platforms in your environment. If so, dig a little deeper and call Sun support to find out more about these patches. Do a thorough risk analysis with Sun, and with your own IT management, and then select the patches for candidates in creating your patch cluster.

  • Check for Recommended and Security Patches

    Review the README files for each one of these patches and see which ones are applicable for your environment. For example, if there is a fix for a Fibre Channel Arbitrated Loop (FC-AL) card, and you don't use Fibre Channel in your environment, this patch may not be required for your system. When it comes to security patches, it is a best practice to apply all Recommended and Security patches, and then be selective about all other patches.

  • Verify Patches With Your Vendors

    While selecting patches, ensure that applying a patch or a cluster of patches will not break an application that works well with the current version of Solaris OE. The patch selection process should include contacting the applications and RDBMS vendors to make sure that applications work well after applying these patches to Solaris OE. Testing, as discussed in Phase 2, will also surface compatibility issues.

  • Analyze Patch Dependencies

    Analyzing the patches for dependencies is also an important factor in patch selection. The Patch Manager tool listed in TABLE 1 helps with dependency analysis. It is also important to check for nested dependencies.

  • Phase 4: Planning the Patch Rollout

    Proper patch management strategy includes a plan that tracks all patches, and provides a means to back out of any patch. This part of the strategy must take place before the patch rollout.

    Patch Tracking—Building a Patch Store

    It is advantageous to create a server (with sufficient bandwidth and processor power to deploy patches through the network) that can serve as a patch repository, or patch store, and can be used for the following:

  • Providing an archive of all patch clusters that were ever rolled out.

  • Functioning as a patch server for patch clusters that are planned for rollout.

  • Aiding with version control for all patches to keep a history of patches applied to various systems and environments. The following table sample can be used as a template for a simple version control and record keeping:

    Patch Cluster Name and Number

    Directory

    Installation Date/Time

    Environment Names

    System Names

    SUNWyyy/yy-24

    /home/patches

    09/30/02 18:00 PST

    Retail Web Env/Integration Test Subenv.

    Mercury, Venus, Mars

  • Tracking troublesome patches. First remove the problem patch from the patches available in the patch store, and create the following table that can be used as a template for a simple way of tracking problem patches:

    Patch Cluster Name and Number

    Directory

    Problem Details

    Type and Name of System Where Problem Occurred

    Name and Type of Environment

    SUNWxxx

    Security fix

    Broke rsh command

    Sun Fire 4800 (Mercury)

    Integration test sub-env under retail web env/mission critical

  • Tracking change management. A table can be stored in the patch store with the following details:

    Patch Cluster Name and Number

    Business Reason for Patch

    Patch System Administrator

    Lead System Administrator and Architect Approver

    Management Approver

    SUNWxxx

    Improves users' response time.

    John K. Administrator

    Bill D. Lead

    Tom S. Manager

  • Once the patch store is created and the proper records are kept, you have the following patch information available:

  • A patch archive with tested patches ready for installation in your production environment.

  • A record of all systems and all patches that have been applied in your environment.

  • A history of patches that caused problems and required the patch to be backed out. The patch store can be used to generate a list of all systems and environments in which a particular patch has been applied.

  • Contingency Planning—Devise a Patch Back-out Method

    There is always a chance that the installation of a patch cluster will cause something to break or degrade, even after testing in preproduction environments. No matter which type of environment you are planning to patch, you should make appropriate contingency plans by defining a method to back out of an installed patch cluster. The following methods offer some ideas.

    Method A

    This method is the simplest way to back out of a patch and can be used in a business operational environment. Every Sun Patch comes with a README file with instructions on how to install the patch and how to back out of a patch. By default, installing a patch cluster saves an original version of the objects being patched in the /var/sadm/patch directory. The back-out script uses the saved objects to restore the software to pre-patched state. In some cases, even though you've installed an entire patch cluster, patches can be backed out only one patch at a time using the patchrm command. To take extra measures to make sure that your back-out plan works, apply the patch cluster to a test system, and follow the back-out instructions in the README to make sure you are able to successfully back out of the patch cluster.

    NOTE

    The patch installation command offers a -nosave option which prevents the saving of the existing objects. It is highly recommended not to use this option, just in case the need arises to back out of a patch cluster.

    Method B

    This method can be used in a business critical environment. This method involves using method A, but requires that you back up your Solaris OE to a tape before applying the patch cluster. Use the ufsdump or vxdump commands to back up to tape depending on what type of file system (ufs or vxfs) your Solaris OE is using. The system must be in a quiesced state when a backup is taken. In this case, in addition to the back-out script, you have a a backup to restore your Solaris OE to the a pre-patched state. Alternatively, since tape restores are very slow, business critical environments that cannot wait for a slow recovery from tape, can maintain an additional disk and use the UNIX™ dd command to make a copy of the boot disk.

    Method C

    This method can be used in a nonclustered mission critical environment where downtime to the production system can be minimized by using a tool called Solaris_ Live Upgrade5 software during the patch rollout process. Solaris Live Upgrade allows you to make a replica of the boot image of the production system while it is up and running and in a low-usage period. Solaris Live Upgrade software can first be used to make a copy of the boot environment, the patch cluster can be applied to the copy, and the copy can be taken through a rigorous testing process. The copy can be moved to a test system for thorough testing. If everything goes well with the tests, Solaris Live Upgrade software can be used to switch the copy to become the active production boot environment. The only downtime will be the time taken to do the Solaris Live Upgrade software switch, which is equivalent to the time taken to reboot a system. Following the procedure outlined in Method B is a prerequisite. In addition to that, consider making two tape copies of your Solaris OE in case one of the tapes becomes unusable.

    Method D

    This method can be used in a clustered mission critical environment. Sun Cluster software is usually put in place for high availability in mission critical environments. A clustered environment gives the opportunity to minimize downtime of the actual production system during patch rollouts. The minimizing process requires breaking the cluster, keeping the primary node running in a production mode, applying the patch cluster to the standby node, and conducting stress and regression tests using the standby node. After successful testing, the standby node is made the active production system, the patches are applied to the primary production node, stress tested and regression tested, and finally both nodes are moved into the cluster. Downtime is minimized to the time it takes to remove the nodes from the cluster and the time to put the cluster back together. This is typically equivalent to the time it takes to reboot a production system. Following the procedures outlined in Method B is a prerequisite.

    Phase 5: Obtaining Change Management Approval and Notifying Other Groups

    Once the required patch cluster has been created, the next step is to get approval from the appropriate change management authorities. In some companies, there is a change advisory board (CAB), or sometimes referred to as a change control board (CCB). The CAB exists to approve changes and to assist in the assessment and prioritization of changes.

    The kinds of steps that relate to patch management change control are as follows:

  • Communicate the nature of the change in the established format for your organization. This might entail completing a change management form that describes the planned changes, the business justifications, list of departments and systems affected, dates, expected outcome, contingency plans (patch back-out plan), required resources, and so forth.

  • Obtain formal change management approvals. This might require paper or electronic signatures as defined in your change management processes. For example, all CAB members, Business Unit Manager for the system in which the change is being made, IT director, and so on might have authority. Some companies' processes require some end-user approvals also. Approvals must be obtained before moving to the next step. Approved forms must be filed carefully for future reference and future internal and external audits.

  • Update the change control information in the patch store as explained in Phase 4.

  • Employ the use of implementation management6 for patches that constitute major changes. This is a function of the ITIL standard change management process that facilitates the build-out and preparation necessary for successful deployment of significant changes. If the patch rollout results in minor changes the implementation management portion can be skipped.

  • Make sure that you notify all the appropriate departments. Some departments to consider are as follows:

  • Help desk—Tell them about the impending change, with date and time of introduction of change in production. This will give help desk an opportunity to be prepared for additional calls during that period by arranging for additional personnel or by asking the existing personnel to be on high alert.

  • System management and monitoring center—They should know about the change so that they can anticipate any alerts and prepare for problem diagnosis as needed.

  • Call Center or Escalation center—If a problem occurs after the change is made, and if the problem was caused by the new change, the escalation managers will at least know where to start looking to conduct root cause analysis.

  • _ Vendors related to the system—This includes application vendors, database vendors, hardware vendors and other critical infrastructure vendors.

  • Users—Provide contact information so they can communicate any issues as they arise.

  • These are some typical considerations for mission critical environments. Your data centers no doubt have a set of policies and procedures for communication and approvals that might not be outlined in this article. Your polices obviously must be taken into consideration.

    Phase 6: Executing the Patch Rollout

    The standard change management process requires that this phase be included in the execution management7 process for promotion to the production environment.

    In Phase 6, it's finally time to install the patch clusters. Depending on the environment (mission critical, business critical, or business operational) and the rollout scheme (regularly scheduled, rapid, or emergency), perform the initial rollout into the appropriate test environment. The testing phase should include three levels of testing:

  • Solaris OE level testing

    These tests involve creating and running a generic system script that performs commands such as ping, netstat, process comparisons, NFS test, iostat, and so on. The script helps to validate the basic operation of the operating environment after the patch cluster is installed.

  • Application level testing

    These tests check various application functionality and ensure that everything still works. For example, in an environment with web servers, application servers, middleware servers, and database servers in various tiers, application of a patch cluster to any one tier might affect other tiers in terms of functionality. Testing end users' functionality helps ensure that all tiers are in working order, and that all tiers work well together after applying the patch cluster.

  • Preproduction level testing

    Testing in a preproduction environment ensures that application functionality continues to work in an environment that closely resembles the production environment with similar storage area networks (SANs), network infrastructure, security infrastructure, and so on. For example, the combination of applying a patch to a security hardened production environment might show problems that are not seen in the development or test environments.

  • When the patch cluster testing is done, perform the patch rollout in your production environment.

    Phase 7: Performing Ongoing Patch Maintenance

    Even though following the previous phases keeps the patches up to date on all the systems, there can be occasional emergency rollouts. This can occur over a period of time and result in systems that are out of sync with each other. Over a period of time, patches might get out-of-date relative to the latest patches from the SunSolve Online program. The process used by system managers might fall through the cracks if there is no on-going audit of this patch identification process. A simple way to automate this maintenance process is described below.

    Sun Professional Services supplies a tool called i-status as part of the Application Readiness Service (ARS) offering. This tool is a configuration monitoring tool. It is also called a dynamic run book because any changes made to a system configuration are automatically updated within i-status. The i-status tool has an easy-to-use GUI that shows the latest configuration of the system. Without i-status, a system administrator has to manually update a static run book. In addition to maintaining up-to-date configuration data of one or more systems, i-status can be used to monitor and compare patch levels of various systems.

    FIGURE 8 shows an i-status screen that has a list of hosts. The % current column shows how current the patches are on each system.

    Figure 08FIGURE 8 Current Patch Report in i-status Tool

    FIGURE 9 shows another i-status screen. There are five columns showing five different systems. The rows that have underlined patches show patches that are out of revision level. The first row shows that a patch is missing on some systems.

    Figure 09FIGURE 9 Patches Compared in i-status Tool

    NOTE

    Some systems intentionally do not have the latest patches installed. Use the i-status tool as a way of gathering information, not as a definitive guide for building your next patch cluster.

    The i-status tool requires the latest patch cross reference file from the SunSolve Online program. This file must always be up-to-date. To ensure you have the latest file, you can use a scheduler like the UNIX cron utility to periodically download the patch cross reference file. The scheduler can also be configured to remind the you to check the i-status console periodically.



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    SUN 310-345 Exam (Sun Certified System Administrator for Sun Cluster 3.2) Detailed Information



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