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zfs [2015/03/24 10:05] – niziaklinux:fs:zfs [2021/05/10 20:42] (current) – niziak
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 ====== ZFS ====== ====== ZFS ======
 +
 +[[https://arstechnica.com/information-technology/2020/05/zfs-101-understanding-zfs-storage-and-performance/|ZFS 101—Understanding ZFS storage and performance]]
 +
 +[[https://lists.debian.org/debian-user/2012/05/msg01026.html]]
 +
 Features: Features:
- - data pools (tanks) are abstraction aggregate block devices (simple, mirror, raidz, spares, etc) +  * data pools (tanks) are abstraction aggregate block devices (simple, mirror, raidz, spares, etc) 
- - data set is created on data pool or another (parent) data set. +  * data set is created on data pool or another (parent) data set. 
- - whole data pool space is shared between dataset (no fixed partition size problem). Size of data set can be limited using quota +  * whole data pool space is shared between dataset (no fixed partition size problem). Size of data set (and its descendants) can be limited using quota 
- - compression +  * compression 
- - block level deduplication (not usable for emails with attachment, where attachment are shifted to different offset)+  * block level deduplication (not usable for emails with attachment, where attachment are shifted to different offset) 
 + 
 +OpenZFS2.0.0 (Dec 20) [[https://github.com/openzfs/zfs/releases/tag/zfs-2.0.0]]: 
 +  * Sequential resilver (rebuild only used by data portions) 
 +  * Persistent L2ARC cache (survives between reboots) 
 +  * ZSTD 
 +  * Redacted replication (replicate with some data excluded) 
 +  * FreeBSD and Linux unification
  
 Proposed use case: Proposed use case:
 +POOL created on encrypted LUKS block device.
 +
 +<code>
 + POOL
 +   |-- /filer (quota)
 +   |     |- foto 
 +   |     |- mp3 (dedup)
 +   |     |- movies
 +   |     +- backup (copies=2, compression)
 +   |
 +   |-- /home (compression, dedup, quota)
 +   +-- /var (quota)
 +         +- log (compression)
 +</code>
 +
 +===== ZFS implementations =====
 +
 +ZFS-Fuse 0.7 is using old pool version 23, where [[http://zfsonlinux.org|ZFSonLinux]] is using pool version 28.
 +[[http://exitcode.de/?p=106|zfs-fuse vs. zfsonlinux]]
 +
 +
  
 ===== Creating ZFS dataset ===== ===== Creating ZFS dataset =====
  
-<code>+<code bash>
 zpool create INBOX /dev/loop0 /dev/loop1 /dev/loop2 /dev/loop3 zpool create INBOX /dev/loop0 /dev/loop1 /dev/loop2 /dev/loop3
 </code> </code>
  
-<code>+<code bash>
 # zpool list # zpool list
 NAME    SIZE  ALLOC   FREE    CAP  DEDUP  HEALTH  ALTROOT NAME    SIZE  ALLOC   FREE    CAP  DEDUP  HEALTH  ALTROOT
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 </code> </code>
  
-<code>+<code bash>
 # zpool status # zpool status
   pool: INBOX   pool: INBOX
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 Dataset "INBOX" is also automatically created based on zpool name "INBOX". It is mounted as /INBOX Dataset "INBOX" is also automatically created based on zpool name "INBOX". It is mounted as /INBOX
  
-<code>+<code bash>
 # zfs list # zfs list
 NAME    USED  AVAIL  REFER  MOUNTPOINT NAME    USED  AVAIL  REFER  MOUNTPOINT
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 |-- |--
 |squashfs    |               | 365 MB       |       | |squashfs    |               | 365 MB       |       |
- 
  
  
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-====== References: ======+ 
 +<code bash> 
 +zfs get compressratio 
 +</code> 
 + 
 +===== References: ===== 
 +[[http://docs.oracle.com/cd/E19253-01/819-5461/6n7ht6qu6/index.html]] 
 +[[https://wiki.freebsd.org/ZFSQuickStartGuide]]
  
 [[http://www.funtoo.org/ZFS_Fun|http://www.funtoo.org/ZFS_Fun]] [[http://www.funtoo.org/ZFS_Fun|http://www.funtoo.org/ZFS_Fun]]