ZFS kasutamine operatsioonisüsteemiga Ubuntu 18.04

Sissejuhatus

TODO

Tõõpõhimõte

TODO

• erinevalt mdadm raidist ei toimu taustal vaikimisi kord kuus mirrori lõhkumine ja uuesti ehitamine

Tarkvara paigaldamine

# apt-get install zfsutils-linux

Kasutamine

Pool tekitamine

# zpool create -o ashift=12 tank /dev/vdb

Tulemus

# zpool list
NAME   SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
tank  21.9G   468K  21.9G         -     0%     0%  1.00x  ONLINE  -

taustal tekib kaks partitsiooni

# fdisk /dev/sdb -l
Disk /dev/sdb: 1 TiB, 1099511627776 bytes, 2147483648 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 16384 bytes / 16777216 bytes
Disklabel type: gpt
Disk identifier: 459DC343-EA59-DC4F-AD3F-C2033AB84C2A

Device          Start        End    Sectors  Size Type
/dev/sdb1        2048 2147465215 2147463168 1024G Solaris /usr & Apple ZFS
/dev/sdb9  2147465216 2147481599      16384    8M Solaris reserved 1

Suurendamine

# zpool set autoexpand=on tank

suurendada plokkseade ja öelda partprobe

# partprobe /dev/vdb

vaadata tulemust

 # zpool status -v
  pool: tank
 state: ONLINE
  scan: none requested
config:

	NAME        STATE     READ WRITE CKSUM
	tank        ONLINE       0     0     0
	  vdb       ONLINE       0     0     0

errors: No known data errors

Mountpoint määramine, nt

# zfs set mountpoint=/srv/vmail tank

NFS

Serveris

# zfs set sharenfs=on tank/imre-1

Kliendis

# mount 192.168.110.89:/srv/imre-yks /mnt
# mount
..
192.168.110.89:/srv/imre-yks on /mnt type nfs4 (rw,relatime,vers=4.2,rsize=262144,wsize=262144,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.110.33,local_lock=none,addr=192.168.110.89)

Märkused

• systemctl zfs asjad

# systemctl | grep zfs
● zfs-import-cache.service                loaded failed failed    Import ZFS pools by cache file                                               
  zfs-load-module.service                 loaded active exited    Install ZFS kernel module                                                    
  zfs-mount.service                       loaded active exited    Mount ZFS filesystems                                                        
  zfs-share.service                       loaded active exited    ZFS file system shares                                                       
  zfs-zed.service                         loaded active running   ZFS Event Daemon (zed)                                                       
  zfs-import.target                       loaded active active    ZFS pool import target                                                       
  zfs.target                              loaded active active    ZFS startup target     

• peale 'zpool destory tank' ütlemist ja arvuti järgmist rebooti paistab selline olukord

root@portaal-to-maildir-1a:~# systemctl status zfs-import-cache.service
● zfs-import-cache.service - Import ZFS pools by cache file
   Loaded: loaded (/lib/systemd/system/zfs-import-cache.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Sat 2019-02-16 20:22:36 EET; 1min 8s ago
     Docs: man:zpool(8)
  Process: 572 ExecStart=/sbin/zpool import -c /etc/zfs/zpool.cache -aN (code=exited, status=1/FAILURE)
 Main PID: 572 (code=exited, status=1/FAILURE)

Feb 16 20:22:34 portaal-to-maildir-1a systemd[1]: Starting Import ZFS pools by cache file...
Feb 16 20:22:36 portaal-to-maildir-1a zpool[572]: cannot import 'tank': no such pool or dataset
Feb 16 20:22:36 portaal-to-maildir-1a zpool[572]:         Destroy and re-create the pool from
Feb 16 20:22:36 portaal-to-maildir-1a zpool[572]:         a backup source.
Feb 16 20:22:36 portaal-to-maildir-1a systemd[1]: zfs-import-cache.service: Main process exited, code=exited, status=1/FAILURE
Feb 16 20:22:36 portaal-to-maildir-1a systemd[1]: zfs-import-cache.service: Failed with result 'exit-code'.
Feb 16 20:22:36 portaal-to-maildir-1a systemd[1]: Failed to start Import ZFS pools by cache file.

ZFS puhul on võimalus kasutada acl'i

TODO

ZFS ketaste tõstmine ühest arvutist teise

Väited

• võiks jälgida zfs versioone

# zpool upgrade -v
This system supports ZFS pool feature flags.

The following features are supported:

FEAT DESCRIPTION
-------------------------------------------------------------
async_destroy                         (read-only compatible)
     Destroy filesystems asynchronously.
empty_bpobj                           (read-only compatible)

...

The following legacy versions are also supported:

VER  DESCRIPTION
---  --------------------------------------------------------
 1   Initial ZFS version
 2   Ditto blocks (replicated metadata)
 ...

 25  Improved scrub stats
 26  Improved snapshot deletion performance
 27  Improved snapshot creation performance
 28  Multiple vdev replacements

For more information on a particular version, including supported releases,
see the ZFS Administration Guide.

Millised poolid on lisatud ketaste tõttu kasutatavad

# zpool import
   pool: sn_zfs_ssd
     id: 2639366720711406682
  state: ONLINE
 status: The pool was last accessed by another system.
 action: The pool can be imported using its name or numeric identifier and
	the '-f' flag.
   see: http://zfsonlinux.org/msg/ZFS-8000-EY
 config:

	sn_zfs_ssd  ONLINE
	  sda       ONLINE
	  sdb       ONLINE

Kasutusse võtmine

# zpool import -f sn_zfs_ssd
# zpool list
NAME         SIZE  ALLOC   FREE  CKPOINT  EXPANDSZ   FRAG    CAP  DEDUP    HEALTH  ALTROOT
sn_zfs_ssd  1.81T   988G   868G        -         -    23%    53%  1.00x    ONLINE  -

Monteerimine alternatiivsesse asukohta

# mkdir /mnt/bpool
# zpool import -R /mnt/bpool bpool

Checkpoint kasutamine

TODO

Kasulikud lisamaterjalid

• https://blog.programster.org/sharing-zfs-datasets-via-nfs
• https://ubuntu.com/tutorials/using-zfs-snapshots-clones#1-overview