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Old 03-16-2012, 10:44 AM   #1
Registered: Jul 2006
Distribution: UBUNTU, CentOS, FEDORA 8
Posts: 474

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Break ZFS Mirror

Hi guys is it possible to break a ZFS mirror, im testing to remove mirror with fool1 and fool2.

bash-3.00# zpool status
  pool: zfspool
 state: ONLINE
status: One or more devices has experienced an unrecoverable error.  An
        attempt was made to correct the error.  Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
        using 'zpool clear' or replace the device with 'zpool replace'.
 scrub: resilver completed after 0h0m with 0 errors on Fri Mar 16 23:34:21 2012

        NAME           STATE     READ WRITE CKSUM
        zfspool        ONLINE       0     0     0
          mirror       ONLINE       0     0     0
            /zfsfool2  ONLINE       0     0    24  66.5K resilvered
            /zfsfool1  ONLINE       0     0     0
          mirror       ONLINE       0     0     0
            /zfsfool   ONLINE       0     0     0
            /zfsfool3  ONLINE       0     0     0

errors: No known data errors
Old 03-18-2012, 08:49 AM   #2
Registered: Feb 2004
Location: Outside Paris
Distribution: Solaris 11.3, Oracle Linux, Mint
Posts: 9,707

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It is possible to break a mirror as long as there is still a copy of the data.

You can for example remove zfsfool1 for the first mirror and zfsfool3 from the second one:
zpool detach /zfsfool1 zfspool
zpool detach /zfsfool3 zfspool
However, you can't remove both zfsfool1 and zfsfool2 as they hold non redundant data.
Old 03-19-2012, 06:59 AM   #3
Registered: Jul 2006
Distribution: UBUNTU, CentOS, FEDORA 8
Posts: 474

Original Poster
Rep: Reputation: 30
ok... now thats clear.. thanks


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