{"id":12761,"date":"2019-09-27T14:46:43","date_gmt":"2019-09-27T12:46:43","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/red-hat-enterprise-linux-8-stratis\/"},"modified":"2019-09-27T14:46:43","modified_gmt":"2019-09-27T12:46:43","slug":"red-hat-enterprise-linux-8-stratis","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/red-hat-enterprise-linux-8-stratis\/","title":{"rendered":"Red Hat Enterprise Linux 8 \u2013 Stratis"},"content":{"rendered":"

The Initial Release (8.0.0) of Red Hat Enterprise Linux 8 is available since May 2019.
\nI’ve already blogged about one of its new feature (AppStream<\/a>) during the Beta version. In this post I will present Stratis, which is a new local storage-management solution available on RHEL8.
\n\"\"<\/a><\/p>\n

Introduction<\/h3>\n

LVM, fdisk, ext*, XFS,… there is plenty of terms, tools and technologies available for managing disks and file systems on a Linux server. In a general way, setting up the initial configuration of storage is not so difficult, but when it comes to manage this storage (meaning most of the time extend it), that’s where things can get a bit more complicated.
\nThe goal of Stratis is to provide an easy way to work on local storage, from the initial setup to the usage of more advanced features.
\nLike Btrfs or ZFS, Stratis is a “volume-managing filesystems”. VMF’s particularity is that it can be used to manage volume-management and filesystems layers into one, using the concept of “pool” of storage, created from one or more block devices.<\/p>\n

Stratis is implemented as a userspace daemon triggered to configure and monitor existing components :
\n[root@rhel8 ~]# ps -ef | grep stratis<\/span>
\nroot 591 1 0 15:31 ? 00:00:00 \/usr\/libexec\/stratisd \u2013debug
\n[root@rhel8 ~]#<\/code>
\nTo interact with the deamon a CLI is available (stratis-cli) :
\n[root@rhel8 ~]# stratis --help<\/span>
\nusage: stratis [-h] [--version] [--propagate]
\n{pool,blockdev,filesystem,fs,daemon} ...
\nStratis Storage Manager
\noptional arguments:
\n-h,\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 --help show this help message and exit
\n--version\u00a0 \u00a0 \u00a0 \u00a0 show program's version number and exit
\n--propagate\u00a0 \u00a0 \u00a0 Allow exceptions to propagate
\nsubcommands:
\n{pool,blockdev,filesystem,fs,daemon}
\npool\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Perform General Pool Actions
\nblockdev\u00a0 \u00a0 \u00a0 \u00a0 \u00a0Commands related to block devices that make up the pool
\nfilesystem (fs)\u00a0 Commands related to filesystems allocated from a pool
\ndaemon\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Stratis daemon information
\n[root@rhel8 ~]#<\/code><\/p>\n

Among the Stratis features we can mention :
\n> Thin provisioning
\n> Filesystem snapshots
\n> Data integrity check
\n> Data caching (cache tier)
\n> Data redundancy (raid1, raid5, raid6 or raid10)
\n> Encryption<\/p>\n

Stratis is only 2 years old and the current version is 1.0.3. Therefore, certain features are not yet available such as redundancy for example :
\n[root@rhel8 ~]# stratis daemon redundancy<\/span>
\nNONE: 0
\n[root@rhel8 ~]# <\/code><\/p>\n

Architecture<\/h3>\n

Startis architecture is composed of 3 layers :
\nBlock device<\/strong>
\nA blockdev is the storage used to make up the pool. That could be :
\n> Hard drives \/ SSDs
\n> iSCSI
\n> mdraid
\n> Device Mapper Multipath
\n> …<\/p>\n

Pool<\/strong>
\nA pool is a set of Block devices.<\/p>\n

Filesystem<\/strong>
\nFilesystems are created from the pool. Stratis supports up to 2^4 filesystems per pool. Currently you can only created XFS filesystem on top of a pool.<\/p>\n

\"\"<\/a><\/p>\n

Let’s try…<\/h3>\n

I have a new empty 5G disk on my system. This is the blockdev I want to use :
\n[root@rhel8 ~]# lsblk \/dev\/sdb<\/span>
\nNAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
\nsdb\u00a0 \u00a0 8:16\u00a0 \u00a00\u00a0 \u00a05G\u00a0 0 disk
\n[root@rhel8 ~]#<\/code><\/p>\n

I create pool composed of this unique blockdev…
\n[root@rhel8 ~]# stratis pool create pool01 \/dev\/sdb<\/span><\/code><\/p>\n

…and verify :
\n[root@rhel8 ~]# stratis pool list<\/span>
\nName\u00a0 \u00a0 Total Physical Size Total Physical Used
\npool01\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 5 GiB\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 52 MiB
\n[root@rhel8 ~]#<\/code><\/p>\n

On top of this pool I create a XFS filesystem called “data”…
\n[root@rhel8 ~]# stratis fs create pool01 data<\/span>
\n[root@rhel8 ~]# stratis fs list
\nPool Name\u00a0 \u00a0Name\u00a0 \u00a0 \u00a0 \u00a0 Used\u00a0 \u00a0 \u00a0 \u00a0Created\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Device\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 UUID
\npool01\u00a0 \u00a0 \u00a0 data\u00a0 \u00a0 \u00a0 \u00a0 546 MiB\u00a0 \u00a0Sep 04 2019 16:50\u00a0 \u00a0\/stratis\/pool01\/data\u00a0 \u00a0 \u00a0 \u00a0 dc08f87a2e5a413d843f08728060a890
\n[root@rhel8 ~]# <\/code><\/p>\n

…and mount it on \/data directory :
\n[root@rhel8 ~]# mkdir \/data<\/span>
\n[root@rhel8 ~]# mount \/stratis\/pool01\/data \/data<\/span>
\n[root@rhel8 ~]# df -h \/data<\/span>
\nFilesystem\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Size Used Avail Use% Mounted on
\n\/dev\/mapper\/stratis-1-8fccad302b854fb7936d996f6fdc298c-thin-fs-f3b16f169e8645f6ac1d121929dbb02e 1.0T 7.2G 1017G 1%\u00a0 \u00a0\/data
\n[root@rhel8 ~]#<\/code>
\nHere the ‘df\u2019 command report the current used and free sizes as seen and reported by XFS. In fact this is the thin-device :
\n[root@rhel8 ~]# lsblk \/dev\/mapper\/stratis-1-8fccad302b854fb7936d996f6fdc298c-thin-fs-f3b16f169e8645f6ac1d121929dbb02e<\/span>
\nNAME\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0MAJ:MIN\u00a0 RM\u00a0 SIZE\u00a0 RO\u00a0 TYPE\u00a0 \u00a0 \u00a0MOUNTPOINT
\n\/dev\/mapper\/stratis-1-8fccad302b854fb7936d996f6fdc298c-thin<\/strong>-fs-f3b16f169e8645f6ac1d121929dbb02e\u00a0 253:7\u00a0 \u00a00\u00a0 \u00a0 1T\u00a0 \u00a00\u00a0 stratis\u00a0 \/data
\n[root@rhel8 ~]# <\/code><\/p>\n

This is not very useful, because the real usage of the storage is less due to thin provisioning. And also because Stratis will automatically grow the filesystem if it nears XFS\u2019s currently sized capacity.<\/p>\n

Let’s extend the pool with a new disk of 1G…
\n[root@rhel8 ~]# lsblk \/dev\/sdc<\/span>
\nNAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
\nsdc\u00a0 \u00a0 8:32\u00a0 \u00a00\u00a0 \u00a01G\u00a0 0 disk
\n[root@rhel8 ~]#
\n[root@rhel8 ~]# stratis pool add-data pool01 \/dev\/sdc<\/span><\/code><\/p>\n

…and check :
\n[root@rhel8 ~]# stratis blockdev<\/span>
\nPool Name\u00a0 Device Node\u00a0 Physical Size\u00a0 \u00a0State\u00a0 Tier
\npool01\u00a0 \u00a0 \u00a0\/dev\/sdb\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 5 GiB<\/strong>\u00a0 In-use\u00a0 Data
\npool01\u00a0 \u00a0 \u00a0\/dev\/sdc\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 1 GiB<\/strong>\u00a0 In-use\u00a0 Data
\n[root@rhel8 pool01]# stratis pool list<\/span>
\nName\u00a0 \u00a0Total Physical Size\u00a0 \u00a0 Total Physical Used
\npool01\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 6 GiB<\/strong>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 602 MiB
\n[root@rhel8 ~]#
\n<\/code><\/p>\n

A nice feature of Stratis is the possibility to duplicate a filesystem with a snapshot.
\nFor this test I create a new file on the filesystem “data” we just added :
\n[root@rhel8 ~]# touch \/data\/new_file<\/span>
\n[root@rhel8 ~]# ls -l \/data<\/span>
\ntotal 0
\n-rw-r--r--. 1 root root 0 Sep 4 20:43 new_file
\n[root@rhel8 ~]# <\/code><\/p>\n

The operation is straight forward :
\n[root@rhel8 ~]# stratis fs snapshot pool01 data data_snap<\/span>
\n[root@rhel8 ~]#<\/code><\/p>\n

You can notice that Stratis don’t make a difference between a filesystem and a snapshot filesystem. They are the same kind of “object” :
\n[root@rhel8 ~]# stratis fs list<\/span>
\nPool Name\u00a0 \u00a0Name\u00a0 \u00a0 \u00a0 \u00a0 Used\u00a0 \u00a0 \u00a0 \u00a0Created\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Device\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 UUID
\npool01\u00a0 \u00a0 \u00a0 data\u00a0 \u00a0 \u00a0 \u00a0 546 MiB\u00a0 \u00a0Sep 04 2019 16:50\u00a0 \u00a0\/stratis\/pool01\/data\u00a0 \u00a0 \u00a0 \u00a0 dc08f87a2e5a413d843f08728060a890
\npool01\u00a0 \u00a0 \u00a0 data_snap\u00a0 \u00a0546 MiB\u00a0 \u00a0Sep 04 2019 16:57\u00a0 \u00a0\/stratis\/pool01\/data_snap\u00a0 \u00a0a2c45e9a15e74664bab5de992fa884f7
\n[root@rhel8 ~]# <\/code><\/p>\n

I can now mount the new Filesystem…
\n[root@rhel8 ~]# mkdir \/data_snap<\/span>
\n[root@rhel8 ~]# mount \/stratis\/pool01\/data_snap \/data_snap<\/span>
\n[root@rhel8 ~]# df -h \/data_snap<\/span>
\nFilesystem\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Size\u00a0 Used\u00a0 Avail\u00a0 Use%\u00a0 Mounted on
\n\/dev\/mapper\/stratis-1-8fccad302b854fb7936d996f6fdc298c-thin-fs-a2c45e9a15e74664bab5de992fa884f7\u00a0 1.0T\u00a0 7.2G\u00a0 1017G\u00a0 1%\u00a0 \u00a0 \/data_snap
\n[root@rhel8 ~]#<\/code><\/p>\n

…and check that my test file is here :
\n[root@rhel8 ~]# ls -l \/data_snap<\/span>
\ntotal 0
\n-rw-r--r--. 1 root root 0 Sep 4 20:43 new_file
\n[root@rhel8 ~]#<\/code><\/p>\n

Nice ! But… can I snapshot a filesystem in “online” mode, meaning when data are writing on it ?
\nLet’s create another snapshot from one session, while a second session is writing on the \/data filesystem.
\nFrom session 1 :
\n[root@rhel8 ~]# stratis fs snapshot pool01 data data_snap2<\/span><\/code><\/p>\n

And from session 2, in the same time :
\n[root@rhel8 ~]# dd if=\/dev\/zero of=\/data\/bigfile.txt bs=4k iflag=fullblock,count_bytes count=4G<\/span><\/code><\/p>\n

Once done, the new filesystem is present…
\n[root@rhel8 ~]# stratis fs list<\/span>
\nPool Name Name Used Created Device UUID
\npool01 data_snap2 5.11 GiB Sep 27 2019 11:19 \/stratis\/pool01\/data_snap2 82b649724a0b45a78ef7092762378ad8<\/code> <\/p>\n

…and I can mount it :
\n[root@rhel8 ~]# mkdir \/data_snap2<\/span>
\n[root@rhel8 ~]# mount \/stratis\/pool01\/data_snap \/data_snap2<\/span>
\n[root@rhel8 ~]# <\/code><\/p>\n

But the file inside seems to have changed (corruption) :
\n[root@rhel8 ~]# md5sum \/data\/bigfile.txt \/data_snap2\/bigfile.txt<\/span>
\nc9a5a6878d97b48cc965c1e41859f034<\/span> \/data\/bigfile.txt
\ncde91bbaa4b3355bc04f611405ae4430<\/span> \/data_snap2\/bigfile.txt
\n[root@rhel8 ~]# <\/code><\/p>\n

So, the answer is no. Stratis is not able to duplicate a file system online (at least for the moment). Thus I would strongly recommend to un-mount the filesystem before creating a snapshot. <\/p>\n

Conclusion<\/h3>\n

Stratis is an easy-to-use tool for managing local storage on RHEL8 server. But due to its immaturity I would not recommend to use it in a productive environment yet. Moreover some interesting features like raid management or data integrity check are not available for the moment, but I’m quite sure that the tool will evolve quickly !<\/p>\n

If you want to know more, all is here<\/a>.
\nEnjoy testing Stratis and stay tuned to discover its evolution…<\/p>\n","protected":false},"excerpt":{"rendered":"

The Initial Release (8.0.0) of Red Hat Enterprise Linux 8 is available since May 2019. I’ve already blogged about one of its new feature (AppStream) during the Beta version. In this post I will present Stratis, which is a new local storage-management solution available on RHEL8. Introduction LVM, fdisk, ext*, XFS,… there is plenty of […]<\/p>\n","protected":false},"author":30,"featured_media":12764,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[42],"tags":[1683,1684,73,1685,1462,1686,1687,35,1031],"type_dbi":[],"class_list":["post-12761","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-operating-systems","tag-disk","tag-filesystem","tag-linux","tag-linux-8","tag-red-hat","tag-rhel8","tag-startis","tag-storage","tag-xfs"],"acf":[],"yoast_head":"\nRed Hat Enterprise Linux 8 \u2013 Stratis - dbi Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/red-hat-enterprise-linux-8-stratis\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Red Hat Enterprise Linux 8 \u2013 Stratis\" \/>\n<meta property=\"og:description\" content=\"The Initial Release (8.0.0) of Red Hat Enterprise Linux 8 is available since May 2019. I’ve already blogged about one of its new feature (AppStream) during the Beta version. In this post I will present Stratis, which is a new local storage-management solution available on RHEL8. 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