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HP HP0-J17 : Designing and Implementing the HP StorageWorks EVA4400 Exam

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Btrfs on CentOS: living with Loopback | HP0-J17 PDF Questions and cheat sheet

Introduction

The btrfs filesystem has taunted the Linux community for years, providing a gorgeous array of features and means, but not ever incomes universal acclaim. Btrfs is most likely greater deserving of patience, as its promised capabilities dwarf all peers, incomes it vocal proponents with terrific have an effect on. still, none can argue that btrfs is unfinished, many elements are very new, and stability considerations remain for commonplace capabilities.

many of the intended dreams of btrfs were met. however, pink Hat famously reduce endured btrfs support from their 7.four release, and has allowed the code to stagnate of their backported kernel because that point. The Fedora venture introduced their intention to adopt btrfs because the default filesystem for variations of their distribution, in a seeming juxtaposition. SUSE has maintained btrfs assist for their personal distribution and the more advantageous group for many years.

For users, probably the most eye-catching aspects of btrfs are transparent compression and snapshots; these features are solid, and comparatively easy so as to add as a veneer to stock CentOS (and its friends). administrators are further compelled by adjustable checksums, scrubs, and the ability to amplify in addition to (particularly) decrease filesystem photographs, while some superior btrfs subjects (i.e. deduplication, RAID, ext4 conversion) aren't definitely germane for minimal loopback utilization. The systemd init package also has dependencies upon btrfs, among them machinectl and systemd-nspawn. despite these features, there are many utilization patterns that are not at once applicable to be used with btrfs. it is hostile to most databases and many other classes with incompatible I/O, and may be approached with some care.

both most available suppliers of CentOS-compatible btrfs-enabled kernels are the El Repo Mainline, and the Oracle Unbreakable business Kernel (UEK), but there are massive provisos on aid and features with each and every of these options. Oracle's kernel doesn't put into effect the latest requirements for btrfs checksums which enforce filesystem integrity, and there are different organizational considerations from a CentOS point of view the place Oracle has fallen down. The El Repo Mainline has the latest features, however the use of it's discouraged and it isn't supported. present Fedora kernels also appear to work on CentOS 8, however these installations are extra invasive in getting rid of inventory kernel add-ons. users will face Hobson's alternative based upon their want for superior facets or business support.

nonetheless, with a competent kernel, these elements may also be comfortably enabled on any CentOS, RedHat, or Oracle Linux OS via a loopback mount (at some efficiency penalty) when working on a default XFS host filesystem. In circumstances where these elements are quintessential, they can stay away from a migration to Solaris, FreeBSD, or even SUSE where superior storage points are extra standard.

i will be able to make some reference right here to my previous article on ZFS for Linux, to clarify and translate nomenclature between these two general filesystems. It isn't crucial to bear in mind ZFS to grasp this discussion of btrfs, however the contrast can be effective.

installation

both providers of btrfs-enabled kernels that are most compatible with a CentOS installing present a extremely distinctive event with help and contours. The setting up of both kernels for contrast is probably going probably the most effortless, and the send/acquire part below assumes that their facets are both latest.

CentOS 7 did guide native btrfs as a customized option within the OS installer (as a "expertise preview"), however this become faraway from the CentOS eight installer, so it won't be conered here. CentOS 8 is used for all examples offered; CentOS 7 clients may still doubtless opt for the UEK.

To install the Oracle UEK, add the following file as /etc/yum.repos.d/uek-olx.repo (for CentOS 7, change the "ol8/OL8" to "ol7/OL7"):

[ol8_UEKR6] identify=newest Unbreakable enterprise Kernel unencumber 6 for Oracle Linux $releasever ($basearch) baseurl=https://yum.oracle.com/repo/OracleLinux/OL8/UEKR6/$basearch/ gpgkey=file:///and so forth/pki/rpm-gpg/RPM-GPG-KEY-oracle gpgcheck=1 enabled=1

Load the GPG key for the vital repo, as (slightly incorrectly) described in Oracle's directions:

curl -o /and many others/pki/rpm-gpg/RPM-GPG-KEY-oracle \ https://yum.oracle.com/RPM-GPG-KEY-oracle-ol8

For an automated installation of the UEK, execute the following (omit the devel equipment if you do not need a C compiler):

yum installation kernel-uek btrfs-progs btrfs-progs-devel

I even have added the options --disablerepo=AppStream, --disablerepo=BaseOS, and --disablerepo=extras to coerce dnf to work via a restrictive firewall, pulling best from Oracle's repository:

dnf --disablerepo=AppStream \ --disablerepo=BaseOS \ --disablerepo=extras \ deploy kernel-uek btrfs-progs btrfs-progs-devel

The effects of this command are beneath:

closing metadata expiration check: 0:04:38 in the past on Tue 15 Sep 2020 11:forty three:34 AM CDT. Dependencies resolved. ================================================================================ equipment Arch version Repo measurement ================================================================================ installing: btrfs-progs x86_64 5.four.0-1.el8 ol8_UEKR6 869 okay btrfs-progs-devel x86_64 5.4.0-1.el8 ol8_UEKR6 52 okay kernel-uek x86_64 5.4.17-2011.6.2.el8uek ol8_UEKR6 60 M Upgrading: linux-firmware noarch 999:20200124-999.four.git1eb2408c.el8 ol8_UEKR6 100 M Transaction summary ================================================================================ installation three applications improve 1 package complete down load measurement: 161 M is that this adequate [y/N]: y Downloading packages: (1/four): btrfs-progs-devel-5.4.0-1.el8.x86_64.rpm 21 kB/s | fifty two kB 00:02 (2/4): btrfs-progs-5.four.0-1.el8.x86_64.rpm 225 kB/s | 869 kB 00:03 (3/4): kernel-uek-5.4.17-2011.6.2.el8uek.x86_64 2.1 MB/s | 60 MB 00:29 (four/four): linux-firmware-20200124-999.four.git1eb2408 1.1 MB/s | 100 MB 01:27 -------------------------------------------------------------------------------- total 1.eight MB/s | 161 MB 01:30 latest Unbreakable business Kernel release 6 3.0 MB/s | 3.1 kB 00:00 Importing GPG key 0xAD986DA3: Userid : "Oracle OSS group (Open source utility neighborhood) " Fingerprint: 76FD 3DB1 3AB6 7410 B89D B10E 8256 2EA9 AD98 6DA3 From : /and many others/pki/rpm-gpg/RPM-GPG-KEY-oracle is that this ok [y/N]: y Key imported successfully running transaction determine Transaction verify succeeded. operating transaction testTransaction check succeeded. working transaction Preparing : 1/1 Upgrading : linux-firmware-999:20200124-999.four.git1eb2408c.el8.no 1/5 installation : btrfs-progs-5.four.0-1.el8.x86_64 2/5 installing : btrfs-progs-devel-5.4.0-1.el8.x86_64 3/5 operating scriptlet: kernel-uek-5.four.17-2011.6.2.el8uek.x86_64 four/5 setting up : kernel-uek-5.4.17-2011.6.2.el8uek.x86_64 four/5 working scriptlet: kernel-uek-5.four.17-2011.6.2.el8uek.x86_64 four/5 Cleanup : linux-firmware-20191202-97.gite8a0f4c9.el8.noarch 5/5 running scriptlet: kernel-uek-5.four.17-2011.6.2.el8uek.x86_64 5/5 running scriptlet: linux-firmware-20191202-97.gite8a0f4c9.el8.noarch 5/5 Verifying : btrfs-progs-5.4.0-1.el8.x86_64 1/5 Verifying : btrfs-progs-devel-5.4.0-1.el8.x86_64 2/5 Verifying : kernel-uek-5.four.17-2011.6.2.el8uek.x86_64 3/5 Verifying : linux-firmware-999:20200124-999.four.git1eb2408c.el8.no 4/5 Verifying : linux-firmware-20191202-ninety seven.gite8a0f4c9.el8.noarch 5/5 put in items updated. Upgraded: linux-firmware-999:20200124-999.four.git1eb2408c.el8.noarch installed: btrfs-progs-5.four.0-1.el8.x86_64 btrfs-progs-devel-5.4.0-1.el8.x86_64 kernel-uek-5.4.17-2011.6.2.el8uek.x86_64 comprehensive!

For a manual deploy, pull the newest UEK and associated RPMs from the repository without delay:

https://yum.oracle.com/repo/OracleLinux/OL8/UEKR6/x86_64/

After setting up, the UEK will configure itself as the default boot kernel. note also that a brand new firmware equipment is installed within the dnf session above (be organized to downgrade it again to the CentOS version if the UEK is uninstalled).

There are two essential complications with the UEK, each in normal and from the CentOS viewpoint.

First, the Oracle UEKR6 is (currently) too historical to make use of the newest checksum features of btrfs (defined within the subsequent section).

2nd, paid help is purchasable for the UEK on CentOS, but simplest after a conversion of the complete system to Oracle Linux. Loading the UEK does not trigger this conversion. furthermore, the conversion process appears broken for Centos eight. When attempting to run the centos2ol.sh converter script, it halts with an error that python2 is required. After installing python2 from AppStream, the script fails with the message: "You appear to be working an unsupported distribution. For information, please e mail <ksplice-support_ww@oracle.com>." analyzing the script, most effective CentOS models 5, 6, and seven are allowed, and the lack of CentOS 8 support is also hinted on Oracle's web site ("centos2ol.sh can convert your CentOS 6 and 7 techniques to Oracle Linux"). because the CentOS 8 platform has been attainable for over a 12 months, Oracle's script seems to be badly out of date. it is questionable if Oracle helps the CentOS eight platform in any respect.

The El Repo undertaking prior to now maintained a ancient archive of the remaining purple Hat backported btrfs source. while this idled edition turned into under no circumstances released from checking out and has been eliminated, the newest btrfs kernel modules are available somewhere else in their programs.

El Repo refers to their Mainline because the "kernel of final lodge" which is usually a developer tool for backporting hardware drivers. It happens to contain btrfs modules with the latest elements, with a purpose to work perfectly with the entire functionality offered right here. To load it, obtain and install the following files from the El Repo Mainline Repository (or installation the entry for the yum repository itself):

rpm -Uvh \ kernel-ml-5.8.5-1.el8.elrepo.x86_64.rpm \ kernel-ml-core-5.eight.5-1.el8.elrepo.x86_64.rpm \ kernel-ml-modules-5.8.5-1.el8.elrepo.x86_64.rpm

installing should still proceed with the following output:

Verifying... ################################# [100%] making ready... ################################# [100%] Updating / installing... 1:kernel-ml-core-5.eight.5-1.el8.elrepo################################# [ 33%] 2:kernel-ml-modules-5.8.5-1.el8.elr################################# [ 67%] 3:kernel-ml-5.eight.5-1.el8.elrepo ################################# [100%]

When finished, reboot, and a brand new red Hat kernel (bringing up Oopta) may still seem in the Grub menu. El Repo Mainline kernel users who decide to leave out the UEK may still seemingly load Oracle's btrfs-progs, as this could permit userspace maintenance.

The Fedora kernel listed under seems to be useful on CentOS, however Fedora accessories should still be put in with lots more desirable care, as they could get rid of stock kernel programs that are offered by using CentOS (each Mainline and the UEK leave the stock kernel intact) when put in in upgrade mode. the use of a Fedora yum repository is probably going no longer secure in this context.

rpm -Uvh \ kernel-5.9.0-0.rc8.20201007git7575fdda569b.30.fc34.x86_64.rpm \ kernel-core-5.9.0-0.rc8.20201007git7575fdda569b.30.fc34.x86_64.rpm \ kernel-modules-5.9.0-0.rc8.20201007git7575fdda569b.30.fc34.x86_64.rpm rpm -qa | grep ^kernel | kind

installation should proceed with right here output:

Verifying... ################################# [100%] getting ready... ################################# [100%] Updating / installation... 1:kernel-core-5.9.0-0.rc8.20201007g################################# [ 17%] 2:kernel-modules-5.9.0-0.rc8.202010################################# [ 33%] three:kernel-5.9.0-0.rc8.20201007git757################################# [ 50%] cleansing up / casting off... four:kernel-4.18.0-193.el8 ################################# [ 67%] 5:kernel-modules-four.18.0-193.el8 ################################# [ 83%] 6:kernel-core-4.18.0-193.el8 ################################# [100%] kernel-5.9.0-0.rc8.20201007git7575fdda569b.30.fc34.x86_64 kernel-core-5.9.0-0.rc8.20201007git7575fdda569b.30.fc34.x86_64 kernel-ml-5.eight.5-1.el8.elrepo.x86_64 kernel-ml-core-5.eight.5-1.el8.elrepo.x86_64 kernel-ml-modules-5.8.5-1.el8.elrepo.x86_64 kernel-modules-5.9.0-0.rc8.20201007git7575fdda569b.30.fc34.x86_64 kernel-tools-4.18.0-193.el8.x86_64 kernel-equipment-libs-4.18.0-193.el8.x86_64 kernel-uek-5.4.17-2011.6.2.el8uek.x86_64

A btrfs-progs kit can even be found in Fedora, and it likewise wipes Oracle's programs if they are current.

rpm -Uvh \ btrfs-progs-5.7-four.fc33.x86_64.rpm \ btrfs-progs-devel-5.7-four.fc33.x86_64.rpm \ libbtrfs-5.7-4.fc33.x86_64.rpm \ libbtrfsutil-5.7-four.fc33.x86_64.rpm

installing should still proceed with the following output:

Verifying... ################################# [100%] making ready... ################################# [100%] Updating / setting up... 1:libbtrfsutil-5.7-4.fc33 ################################# [ 17%] 2:libbtrfs-5.7-4.fc33 ################################# [ 33%] 3:btrfs-progs-5.7-four.fc33 ################################# [ 50%] four:btrfs-progs-devel-5.7-4.fc33 ################################# [ 67%] cleaning up / putting off... 5:btrfs-progs-devel-5.four.0-1.el8 ################################# [ 83%] 6:btrfs-progs-5.4.0-1.el8 ################################# [100%]

The problem with the El Repo Mainline is the inability of aid, edging on lively discouragement of its use. Fedora is probably going an "much more remaining motel" as it can get rid of CentOS kernel packages until installed with top notch care. The newest SUSE kernel could also be of hobby, however here is no longer intended for CentOS, and has now not been attempted here. constructing a customized kernel may deliver the highest quality effects, on the charge of any and all assist.

Btrfs creation and Checksums

Inherent in the creation of a btrfs filesystem is the option of block-level checksums, used to record and enforce integrity and accuracy of all content material. In accurate heritage, this option become restricted to the CRC32C algorithm, which is vulnerable to collisions and isn't fairly applicable for deduplication (which isn't coated here).

The choice of checksums is limited with the aid of both kernels of interest, and the options are stark.

Btrfs has recently implemented new checksums, details of which might be described by man 5 btrfs, excerpted right here for a "3.5GHz intel CPU" (as mentioned on the guide page):

Digest Cycles/4KiB Ratio CRC32C 1700 1.00 XXHASH 2500 1.44 SHA256 105000 sixty one BLAKE2b 22000 13

The hashes above might be time-honored to technical clients of cryptographic applications. The NSA's SHA256 algorithm often has support with CPU primitives for speedy processing, and is sufficiently collision-resistant for deduplication. The XXHASH algorithm asserts wonderful growth over CRC32C in avoidance of hash collisions with minimal influence to throughput.

The difficulty with the above hash decisions is laid simple in the manual pages: "To mount such [a] filesystem [the] kernel must aid the checksums as neatly." It have to be understood that the current Oracle UEKR6 most effective supports CRC32C, and should no longer mount a btrfs filesystem created with some other hash feature, even if the userspace equipment it distributes each allow and encourage it.

For the rest of this document, right here mount aspect will be assumed for their main btrfs filesystem. Please create this mount point to comply with all additional examples:

mkdir /bvault

right here shell fragment demonstrates userspace alternatives versus kernel checksum limitations:

for CSUM in crc32c xxhash sha256 blake2 do fallocate -l 50G /home/CALDRON.BTRFS mkfs.btrfs --csum="$CSUM" /home/CALDRON.BTRFS mount -o loop /domestic/CALDRON.BTRFS /bvault umount /bvault rm -v /home/CALDRON.BTRFS executed

I select the name "caldron" above in awareness of the ZFS zpool "tank" as a name of stronger readability for the brew of points that they are concocting, and that i will every now and then confer with this as the "backing shop." On the Oracle UEK, most effective the CRC32 mount effort will prevail, whereas the El Repo Mainline will run the script with all checksum forms with out error.

the use of fallocate above became impressed via a old article on btrfs loopback contraptions that seeded this dialogue. Loopback mounts are favourite on .ISO images traditionally written to optical media. word that loopback filesystem mounts are generally quickly, however can suffer when fsync() calls are excessive.

The Oracle UEK is a accurate 5.4.17 kernel, but now not fresh adequate to support anything beyond CRC32C, as is gleaned from man 5 btrfs: "seeing that kernel 5.5 there are three greater [checksums] with distinctive traits and exchange-offs regarding speed and energy." When even Oracle neglects to backport new features, they come to see crimson Hat's point.

When operating the UEK, here's the most reliable checksum purchasable on a brand new btrfs filesystem:

fallocate -l 50G /domestic/CALDRON.BTRFS mkfs.btrfs --csum=crc32c /home/CALDRON.BTRFS mount -o loop /domestic/CALDRON.BTRFS /bvault

If the El Repo Mainline is the active kernel, then any checksum carried out by Oracle's mkfs.btrfs could be used.

From a ZFS standpoint, here is all very primitive. ZFS makes it possible for the dynamic choice of any checksum/hash feature, to be applied to any filesystem object. in spite of everything, SHA256 is probably going the favourite option for these wanting extreme records integrity, and willing to forego assist.

transparent Compression

Three compression varieties can also be applied to directory or file objects within a btrfs filesystem. The accessible varieties are, in preference: zstd, lzo, zlib, and none. The project of those compression attributes is maintained as btrfs "metadata," and the kernel will function the file compression as content material is written.

Some historical past and specifics on the btrfs compression settings:

  • zstd - Code contributed via facebook, and permits a numerical selector to be detailed between 1 and eleven, controlling the compression ingredient of a file applied by the kernel.

  • lzo - focuses on performance, does not enable tunable alternate options.

  • zlib - makes use of the standard gzip algorithm, and allows for an element to be applied between 1 and 9.

  • The default compression level, for any tunable algorithm when no longer distinctive, is 3.

    whereas compression may also be globally set as a mount option for the entire of the mounted filesystem, it may well even be applied to particular directories or files. The syntax to say this property is as follows:

    mkdir /bvault/tmp btrfs property set /bvault/tmp compression zstd mkdir /bvault/log btrfs property set /bvault/log compression lzo btrfs property set /bvault/log compression zlib:9btrfs property set /bvault/log compression zstd:11

    latest homes on a filesystem object can also be examined with this syntax:

    btrfs property get /bvault/log compression

    The influence of this command is under:

    compression=zstd:eleven

    The metadata containing the compression settings on file and directory objects cannot be backed up with tar or other utilities that don't seem to be privy to the btrfs internals for this special reputation. The ship/receive section beneath is in a position to replicate all metadata to a new btrfs filesystem, and is the best file circulation utility that captures these hidden settings.

    regrettably, no reporting tools are current in the btrfs-progs kit to determine compression ratios of files on disk. A brute force formula is accessible, lacking granular reporting, the use of df in an easy shell feature to report most effective favored mounts.

    here shell characteristic might be used in later examples, please make notice of it.

    feature ddf while examine a do [[ -z "$b" ]] && printf '%s\n' "$a"; for b; do case "$a" in *"$b"*) printf '%s\n' "$a";; esac; executed; executed

    casual trying out with diverse btrfs filesystems changed into carried out, and stated:

    ddf look at various

    For a big replica of binary facts, here compression effects emerged:

    Filesystem 1K-blocks Used attainable Use% established on /dev/loop0 52428800 1989740 50009460 4% /test1 /dev/loop1 52428800 19106016 32844480 37% /test2

    A extra granular utility is accessible as C source. "[The] compsize [program] takes an inventory of info on a btrfs filesystem and measures used compression varieties and positive compression ratio. there's a patch including help for that; at present or not it's now not merged. that you may variety of bet at its compressed dimension by comparing the output from the df command before and after writing a file, if here's attainable to you."

    to make use of this granular reporting utility, assuming that you've access to a Linux C compiler and are able to prepare compsize, make certain that you have got installed right here kit:

    yum set up btrfs-progs-devel

    After the btrfs source installing, down load the following for C compilation:

    https://raw.githubusercontent.com/kilobyte/compsize/grasp/compsize.c https://uncooked.githubusercontent.com/kilobyte/compsize/grasp/radix-tree.c https://raw.githubusercontent.com/kilobyte/compsize/grasp/endianness.h https://uncooked.githubusercontent.com/kilobyte/compsize/master/kerncompat.h https://uncooked.githubusercontent.com/kilobyte/compsize/master/radix-tree.h

    compile these data into a local binary with here command:

    cc -Wall -std=gnu90 -I/usr/consist of/btrfs \ -g -o compsize compsize.c radix-tree.c

    examine the software. note the sync adventure below - compsize might also fail devoid of it, as a sync experience looks to on the spot kernel compression:

    cp /var/log/messages /var/log/relaxed /bvault/log sync ./compsize /bvault/log/*

    The outcomes of these instructions are beneath:

    Processed 2 information, 15 commonplace extents (15 refs), 0 inline. type Perc Disk usage Uncompressed Referenced total 17% 316K 1.7M 1.7M zstd 17% 316K 1.7M 1.7M

    To examine the documentation on this compression ratio reporting program, get the manual web page:

    https://uncooked.githubusercontent.com/kilobyte/compsize/master/compsize.eight

    study the manual web page with this command:

    # man ./compsize.eight Snapshots

    directors of traditional UNIX methods regularly face requests for recuperation from backups, and infrequently these requests can't be met because of cron schedules of tar that fall backyard of and do not seize crucial activities. once-a-day backups do not cowl temporary facts it truly is delivered, processed, and deleted between the prompted backup cycles.

    Snapshots are "speedy photographs" of file device state which are created very promptly. as the filesystem alterations blocks, a snapshot retains the ancient content material, maintaining it exactly as it regarded. Many snapshots can be taken of a btrfs filesystem and retained as long as disk space is attainable.

    Let's take a image:

    cp /and so forth/passwd /and so on/community /and so on/shadow /bvault/tmp btrfs subvolume photo /bvault \ /bvault/image-"$(date +%Y%m%d%H%MpercentS)"

    Now, let's simulate the lack of important content material, and restoration from the photograph:

    rm /bvault/tmp/shadow ls /bvault/image-*/tmp/shadow

    We see that the snapshot has retained their important file:

    /bvault/image-20200831112752/tmp/shadow

    or not it's that effortless.

    The default snapshots created in btrfs aren't read-best objects; content material may also be added or modified within them:

    cp /and so on/hosts /bvault/snapshot-*/tmp ls /bvault/photograph-*/tmp/hosts

    The photo has now diverged with this new file:

    /bvault/snapshot-20200831112752/tmp/hosts

    study-simplest snapshots may also be created with the -r choice. here's probably preferable for backups, and read-handiest fame is required for send/get hold of services, described beneath.

    There is a few dialogue within the guide pages of the noatime mount choice, relating principally to snapshots, and a URL is outlined as a useful resource for extended dialogue. The noatime alternative has lengthy been typical to boost filesystem efficiency on most UNIX methods, and it takes on further which means with btrfs in preventing image growth, enjoying an extra role with essential limits in btrfs, described beneath.

    Snapshots are special cases of mountable btrfs filesystems; they are "subvolumes" as described below, and they are deleted the equal method as all subvolumes:

    btrfs subvolume delete /bvault/photograph-*/

    A response with a crucial priviso is issued:

    Delete subvolume (no-commit): '/bvault/picture-20200831112752'

    If a crash occurs after a non-committed subvolume deletion, it may well appear after reboot. To drive a commit on the deletion, use either the -c or -C alternate options (the change is explained in the guide pages).

    In ZFS, a picture is with the aid of default examine-best, and an additional step should be taken to instantiate a photo into a study-write "clone." it's unfortunate that btrfs did not reuse this nomenclature for these aspects.

    Resize

    Btrfs in all fairness respectable at growing to be, and is among the few standard filesystems that's able to shrinking. in the case of loopback mounts, the file serving as the "backing save" ought to first be extended before btrfs will recognize further house, and (unluckily) the delivered house will most effective be diagnosed after un/remounting. In shrinking, the filesystem is decreased first, then the backing store is truncated. Counter-intuitively, the truncate utility is the fastest tool for growing or shrinking the backing shop.

    to add ten gigabytes to the caldron, use here command:

    truncate -s +10G /domestic/CALDRON.BTRFS

    Btrfs will no longer instantly respect the new space on-line, however will after after unmounting (be aware that a remount flag is insufficient to prod btrfs to look the brand new space):

    umount /bvault mount -o loop /home/CALDRON.BTRFS /bvault btrfs filesystem resize max /bvault ddf bvault

    The introduced house appears:

    Filesystem 1K-blocks Used attainable Use% hooked up on /dev/loop0 62914560 3652 62372796 1% /bvault

    The resize max above is much more effortless than historical quantity managers and file programs that require particular numerical sizes normally (so lengthy HP-UX VxFS).

    Btrfs can also contract, and it's capable of moving content (filesystems, snapshots, metadata) out of how before releasing the requested house. because the guide pages notice, "...shrinking might take a long time if there are data within the gadget enviornment that’s past the new end. Relocation of the facts takes time."

    Let's retract the currently introduced house:

    btrfs filesystem resize -10G /bvault umount /bvault truncate -s -10G /home/CALDRON.BTRFS

    for sure, a backup may still be taken earlier than trying any resize experience, certainly so for a reduction in size, where the numbers must agree between these utilities all the way down to the byte.

    Let's confirm that the vault survived this operation:

    btrfs assess /home/CALDRON.BTRFS

    The check returns wide popularity:

    Opening filesystem to investigate... Checking filesystem on /home/CALDRON.BTRFS UUID: 5d5b0ada-0ad0-422c-8d91-2cfcc1dee1eb [1/7] checking root gadgets [2/7] checking extents [3/7] checking free space cache [4/7] checking fs roots [5/7] checking simplest csums gadgets (devoid of verifying facts) [6/7] checking root refs [7/7] checking quota companies skipped (not enabled on this FS) found 200704 bytes used, no error found outtotal csum bytes: 4 complete tree bytes: 131072 complete fs tree bytes: 32768 complete extent tree bytes: 16384 btree house waste bytes: 122345 file statistics blocks allotted: 69632 referenced 69632

    And all's well...

    mount -o loop /domestic/CALDRON.BTRFS /bvault ddf bvault

    ...that ends neatly:

    Filesystem 1K-blocks Used accessible Use% installed on /dev/loop0 52428800 3652 51887036 1% /bvault crucial Limits

    within the basic FFS of the previous days of UNIX, a filesystem administrator was panic both with space, and with inodes; running out of either introduced issues to a halt.

    Btrfs introduces a brand new set of issues and behaviors. facts, metadata, and device are all unbiased entities that can commute an active btrfs filesystem into examine-best mode when they are exhausted. counsel on these aspects can be present in the btrfs-filesystem manual web page, and the command to report them is as follows:

    btrfs fi df /bvault

    instance sizes for an empty filesystem could be:

    data, single: complete=1.01GiB, used=25.36MiB device, DUP: complete=32.00MiB, used=sixteen.00KiB Metadata, DUP: total=256.00MiB, used=2.11MiB GlobalReserve, single: complete=three.25MiB, used=0.00B

    historic UNIX versions reserved a undeniable amount of disk area for root that turned into unavailable for other users, preventing a storage disaster from rendering a system unusable. unfortunately, btrfs lacks such protections, and falling into study-only mode is commonly surprising, as the filesystem statistics can be smartly-inside bounds.

    in the previous discussion of the noatime mount alternative above, the URL mentioned within the btrfs guide pages contains comments on ZFS zpools that most effective enable 63/64ths of area to be consumed, emulating the old area reservation. There are additional warnings that atime writes on btrfs might also fail devoid of-of-area error, combating reads from a btrfs filesystem in a examine-only state. the first implulse in the sort of case would be to remount with noatime.

    Extending area is constantly the reply to regain control of examine-best btrfs ahead of cleanup. For loopback mounts, the resizing tools above may still be enough for effortless restore, assuming the host XFS filesystem has attainable house. When btrfs is native on a disk, it can also be wise to reduce it a little bit on its partition, permitting a resize max for emergency upkeep.

    Alternately, quotas will also be introduced, but they come at a value. because the guide web page for btrfs-quota warns, "when quotas are activated, they have an effect on all extent processing, which takes a efficiency hit." If efficiency loss is appropriate, then there are find out how to use quotas to enforce filesystem security.

    ZFS additionally doesn't behave well when overfull, which may cause irreparable damage; btrfs appears slightly more able during this regard, however still traps the unwary. ZFS additionally enables the copies= parameter to reproduction saved information, and applies copies=2 to metadata by way of default; the DUP tags above exhibit that mkfs.btrfs has done the equal, which it all the time does on rotational media, but now not on SSDs.

    Subvolumes

    crimson Hat/Sistina of the past a long time brought us a extent manager, akin to that used by means of HP-UX, that allowed us to transcend traditional MS-DOS partitions and span real disks with a single filesystem. ZFS blurred the quantity supervisor right into a "pool," and dissolved filesystems (datasets) into the pool, dispersing them as it noticed fit, reassembling visibility when required.

    In btrfs, the basis quantity has swallowed the pool, blurring the focus further.

    The introduction of a subvolume in btrfs looks to create a directory:

    btrfs subvolume create /bvault/foo btrfs subvolume list /bvault

    the brand new subvolume properties are suggested via their last command:

    id 257 gen 23 exact level 5 route foo

    besides the fact that children, this listing can be pulled out, just like the tentacles of a hydra, and installed somewhere else the usage of the subvol mount parameter:

    mkdir /foo mount -o loop,subvol=foo /domestic/CALDRON.BTRFS /foo ddf bvault foo

    We see the subvolume on it be newly-assigned mountpoint:

    Filesystem 1K-blocks Used obtainable Use% established on /dev/loop0 52428800 3716 51887036 1% /bvault /dev/loop0 52428800 3716 51887036 1% /foo

    moving the mount aspect is straightforward:

    umount /foo rmdir /foo mkdir /etc/foo mount -o loop,subvol=foo /domestic/CALDRON.BTRFS /etc/foo ddf bvault foo

    sooner than boiled asparagus, the subvolume is relocated.

    Filesystem 1K-blocks Used accessible Use% established on /dev/loop0 52428800 3716 51887036 1% /bvault /dev/loop0 52428800 3716 51887036 1% /and so forth/foo

    When an OS has been put in on a ZFS dataset with a previous image, a rollback experience can also be prompted on the foundation dataset/filesystem to revert it, possibly undoing a failed patch session. below btrfs, booting a photo subvolume to the foundation, then renaming the broken root as an extra subvolume (or with ease deleting it), accomplishes the same effect upon a reboot. SUSE provides equipment for this recreation.

    despite the fact I even have kept away from discussing native btrfs that existed in old CentOS-centric Linux, Oracle Linux 7 does offer thoroughly-supported btrfs for the basis filesystem (/boot is still on XFS, limiting patch rollbacks to non-kernel packages). within the default setting up, an attempt to question the root subvolumes:

    btrfs subvolume listing /

    Will produce here record:

    identity 257 gen 44412 appropriate stage 5 direction root identity 258 gen 44412 desirable stage 5 route homeID 261 gen 44409 properly degree 257 direction var/lib/machines

    Loopback clients of btrfs are unlikely to have wide wants for advanced subvolume mounts, however the point of view is wonderful. it's also satisfying to come back to fstab, instead of holding mounts with a customized tool as ZFS does.

    Defragmentation

    One vastly lamented lack of ZFS is a method of defragmentation, which btrfs gives.

    In a loopback mount configuration on spinning media, the host filesystem should still likely be defragmented previous to defragmenting the contents of the "cauldron." With XFS, the defrag tool can record the inodes of info reorganized when run in verbose mode. If preferred, an XFS defrag action on the cauldron's backing shop may also be validated by first recording the cauldron's inode:

    ls -i /home/CALDRON.BTRFS

    this could record the inode for the backing keep:

    1304021 /home/CALDRON.BTRFS

    On a gadget with spinning media (hard drives, now not solid State Drives/SSDs) run the XFS "filesystem reorganizer," and search for the target inode in /home:

    xfs_fsr -v

    in case your gadget is a mix of spinning and SSD media, best specify the non-SSD filesystems to xfs_fsr.

    With the cauldron constant, set off defragments on all subvolumes inside it:

    btrfs filesystem defragment /bvault -rv btrfs filesystem defragment /and so on/foo -rv

    Organizational complications are additionally now and again remedied with btrfs-balance, which rewrites the complete filesystem and ensures that every one blocks within btrfs will be reallocated. Balancing is usually carried out when including new drives, however can be advantageous for improving corporation on a single gadget.

    SSD contraptions

    Flash storage gifts special concerns for btrfs, as flash media lacks the toughness of normal hard drives. Flash comes in two grades, as decided by way of MOS "floating gate" transistors: Single-Layer Cells (SLC), and Multi-Layer Cells (MLC). business grade flash is universally SLC media, and is often stated doable for a hundred,000 writes per cell earlier than chance of decay and statistics loss. Multi-Layer telephone (MLC) media, generally implemented as removable USB flash, is barely doable for five,000 writes before media end of lifestyles. SLC media trades facts density for longevity, MLC oppositely trades longevity for density.

    Flash media may also be "healed" via heat in extra of 200 degrees Fahrenheit for a long length (the higher the temperature, the less time required). lamentably, no often obtainable flash gadgets take advantage of this property, wherein an conclusion of life mobile can be rejuvenated.

    Storage controllers are embedded in all flash media, which put in force "put on-leveling algorithms" that migrate facts from hot data to rarely-written cells, in order to current consistent lifetime for the total of the storage equipment. The storage controllers are usually in line with embedded ARM or Intel CPUs, and they are now not chiefly comfy.

    Btrfs has alternate options that alter write patterns to flash media with the intention to raise longevity. These options are carried out as mount-time flags: ssd and ssd_spread.

    "[The ssd mount] optimizations make use of the absence of the are seeking for penalty that’s inherent for the rotational instruments. The blocks can also be customarily written quicker and don't seem to be offloaded to separate threads... The ssd_spread mount alternative attempts to allocate into larger and aligned chunks of unused house, and may operate greater on low-conclusion SSDs. ssd_spread implies ssd, enabling all other SSD heuristics as well.

    SSD mount options for btrfs haven't all the time been safe for longevity: "the usage of the ssd mount choice with older kernels than 4.14 has a poor have an effect on on usability and lifelong of modern SSDs. here is fixed in 4.14, see this commit for extra guidance... With [Linux kernel] 4.14+ it is protected and advised once again to make use of the ssd mount choice for non-rotational storage."

    Btrfs filesystems installed on loopback instruments might now not effectively discover that the host XFS filesystem resides on flash/SSD. A check with an hpsa controller featuring mirrored MO0200FCTRN solid-state drives did exhibit that ssd was automatically added to the loopback mount alternatives. if your hardware is not properly detected, adding such mount alternatives may lengthen performance and sturdiness.

    send/get hold of

    Btrfs compression settings (and different metadata) aren't preserved on info or directories when they're moved or copied backyard of a btrfs filesystem. Most backup equipment (i.e. tar, rsync) can't hold these settings. To prevent the lack of this btrfs-property metadata, both btrfs and ZFS present send/receive as a method of [btrfs] metadata protection. additionally, if a migration from CRC32C checksums to a extra advanced hash (i.e. XXHASH, SHA256, BLAKE2) with full metadata preservation is preferred, these are the handiest tools for the job.

    The most advantageous destination of a ship operation have to be a btrfs filesysem in a position to a receive of this uncooked facts.

    The btrfs ship operation have to be referred to as on a study-only subvolume, likely a image created for the express intention of (meta)data circulation. here is illustrated beneath, and ought to be applied with a kernel that is in a position to advanced btrfs checksums:

    fallocate -l 50G /home/GOBLET.BTRFS mkfs.btrfs --csum=sha256 /home/GOBLET.BTRFS mkdir /goblet mount -o loop /domestic/GOBLET.BTRFS /goblet btrfs subvolume image /bvault /bvault/onmyway -r btrfs ship /bvault/onmyway | btrfs receive /goblet btrfs subvolume image /bvault/foo /bvault/offwego -r btrfs send /bvault/offwego | btrfs acquire /goblet

    These ship/receive operations will keep btrfs metadata, including compression settings. No other tool can keep these file attributes. These equipment also have alternate options for incremental backups, expressed as changes between snapshots. ship should likely be part of a complete btrfs backup approach.

    Scrub

    each block written by way of btrfs, be it records, equipment, or metadata, is checksummed. These on-storage checksums can also be walked as a tree, allowing the entire filesystem can also be demonstrated appropriate.

    ZFS, with its center of attention on redundant sources of statistics, can silently fix bad blocks if a redundant kind is discovered it really is relevant. With the btrfs loopback formula presented right here, statistics is not redundant, and btrfs can most effective file and flag facts that fails checksum. in the ZFS lingo, loopback btrfs skill "hating their statistics."

    it is general to apply firmware updates to storage controllers, physical complicated drives, SSD drives, motherboard firmware, and CPU microcode. for example, the HP "aid Pack for Proliant" does exactly when issued each quarter, as do packaged hardware updates for the server structures of many competitors. There are plentiful opportunities for error in these avalanches of firmware, and checksum/scrub validations can observe these vendor firmware screw ups practically as soon as they occur.

    aside from this, "bitrot occurs." records on magnetic disks goes bad with time, due to many factors. Detecting bad statistics is more advantageous than ignoring it.

    in any case, scrub operations should still be performed on btrfs loopback contraptions to assure integrity. The simple syntax for triggering a scrub validation of all block checksums in a btrfs filesystem is:

    btrfs scrub delivery /bvault

    The popularity of a lengthy scrub will also be queried:

    btrfs scrub reputation /bvault

    Even with out redundant information, this should be carried out.

    Conclusion

    there are lots of "tough edges" that are uncovered above with btrfs capabilities and implementations, specifically with the measures taken to enable it for CentOS. still, this is a ways improved than ext2/3/4 and XFS, discarding all the alluring btrfs facets, in that error will also be widespread as a result of all filesystem content material is checksummed.

    it could be advantageous if the builders of btrfs and ZFS could work together to create a single kernel module, with maximal sharing of "cleanroom" code, that carried out each filesystems. Code purges have took place before, in fresh memory; BSD famously expunged AT&T supply from the BSD "UNIX" implementation to produce net/2. an identical effort can be organized to end a single company's handle of filesystem supply.

    Oracle is itself unwilling to settle these questions with both a GPL or BSD license free up of ZFS. Oracle additionally grants a btrfs implementation that's lacking in facets, with inapplicable documentation, and out-of-date assist tools (for CentOS eight conversion). Oracle is the impediment, and a neighborhood effort to purge ZFS source of Oracle's contributions and unify it with btrfs seems probably the most easy option.

    IBM, because the new owner of red Hat, is in a different place, in being in a position to deploy filesystem engineers to clean-room replicate all required Oracle code in a GPL-licensed kernel module enforcing each btrfs and ZFS. should still this sort of filesystem alternately be released under a BSD license, then many unbiased operating techniques could delight in advanced filesystem aspects (think about a ship/acquire between z/OS and Haiku).

    it could also be helpful if other events avoided new filesystem efforts that lack the wide btrfs performance and feature set (i.e. Microsoft ReFS).

    unless such a day that an advanced filesystem turns into a ubiquitous commodity as Linux is as an OS, the user group will continue to be torn between questionable assist, lack of features, and workarounds in a fragmented btrfs group. here is an uncomfortable area to be, and they might do smartly to bear in mind the events liable for maintaining us right here.


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