Remove ZIL/L2ARC device

[joulester]

Hi! I have an ssd that i want to remove from my zfs pool. It is configured as ZIL/L2ARC device.
How do I do? Is it possible?

 

[LnxBil]

Yes, very simple with just a remove command:

root@proxmox /tmp > ls -lh zil l2arc raidz1_disk*
-rw-r--r-- 1 root root 256M Okt 23 08:55 l2arc
-rw-r--r-- 1 root root 256M Okt 23 08:55 raidz1_disk1
-rw-r--r-- 1 root root 256M Okt 23 08:54 raidz1_disk2
-rw-r--r-- 1 root root 256M Okt 23 08:55 raidz1_disk3
-rw-r--r-- 1 root root 256M Okt 23 08:55 zil

root@proxmox /tmp > zpool create test raidz1 /tmp/raidz1_disk* log /tmp/zil cache /tmp/l2arc

root@proxmox /tmp > zpool status -v test
  pool: test
 state: ONLINE
  scan: none requested
config:

    NAME                   STATE     READ WRITE CKSUM
    test                   ONLINE       0     0     0
      raidz1-0             ONLINE       0     0     0
        /tmp/raidz1_disk1  ONLINE       0     0     0
        /tmp/raidz1_disk2  ONLINE       0     0     0
        /tmp/raidz1_disk3  ONLINE       0     0     0
    logs
      /tmp/zil             ONLINE       0     0     0
    cache
      /tmp/l2arc           ONLINE       0     0     0

errors: No known data errors

root@proxmox /tmp > zpool remove test /tmp/zil
root@proxmox /tmp > zpool remove test /tmp/l2arc

root@proxmox /tmp > zpool status -v test
  pool: test
 state: ONLINE
  scan: none requested
config:

    NAME                   STATE     READ WRITE CKSUM
    test                   ONLINE       0     0     0
      raidz1-0             ONLINE       0     0     0
        /tmp/raidz1_disk1  ONLINE       0     0     0
        /tmp/raidz1_disk2  ONLINE       0     0     0
        /tmp/raidz1_disk3  ONLINE       0     0     0

errors: No known data errors

 

[joulester]

thanks! will test that.

 

[joulester]

I did remove the l2arc but I cant remove the zil. Why cant I do that?

root@r710nr2:~# zpool status
  pool: rpool
 state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
        still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
        the pool may no longer be accessible by software that does not support
        the features. See zpool-features(5) for details.
  scan: scrub repaired 0B in 21h18m with 0 errors on Sun Dec  9 21:42:54 2018
config:

        NAME        STATE     READ WRITE CKSUM
        rpool       ONLINE       0     0     0
          raidz1-0  ONLINE       0     0     0
            sdb2    ONLINE       0     0     0
            sdc2    ONLINE       0     0     0
            sdd2    ONLINE       0     0     0
            sde2    ONLINE       0     0     0
            sdf2    ONLINE       0     0     0
          sda1      ONLINE       0     0     0

errors: No known data errors
root@r710nr2:~# zpool remove rpool sda1
cannot remove sda1: only inactive hot spares, cache, or log devices can be removed

 

[hbh7]

For joulester or anyone else who sees this in the future, it looks like sda1 isn't actually a zil given that it's not under a "log" line like in LnxBil's example. It seems to actually be part of the pool as a data storage drive instead, and therefore can't be removed.