I have a ZFS pool in the current state:

[root@zfs01 ~]# zpool status
  pool: zdata
 state: DEGRADED
status: One or more devices could not be used because the label is missing or
        invalid.  Sufficient replicas exist for the pool to continue
        functioning in a degraded state.
action: Replace the device using 'zpool replace'.
   see: http://zfsonlinux.org/msg/ZFS-8000-4J
  scan: scrub repaired 0 in 186h53m with 0 errors on Sun Jan 27 20:53:44 2019

        NAME                                                  STATE     READ WRITE CKSUM
        zdata                                                 DEGRADED     0     0     0
          raidz3-0                                            DEGRADED     0     0     0
            ata-HGST_HUH728080ALE604_2EGWK97X                 ONLINE       0     0     0
            spare-1                                           DEGRADED     0     0     2
              ata-HGST_HUH728080ALE604_2EGWHSGX               UNAVAIL      0     0     0
              ata-HGST_HUH728080ALE604_2EGWD3WX               ONLINE       0     0     0
            ata-HGST_HUH728080ALE604_2EGGVUTX                 ONLINE       0     0     0
            ata-HGST_HUH728080ALE604_2EHG14TX                 ONLINE       0     0     0
            ata-HGST_HUH728080ALE604_2EGWW4XX                 ONLINE       0     0     0
            ata-HGST_HUH728080ALE604_2EGW5A5X                 ONLINE       0     0     0
            ata-HGST_HUH728080ALE604_2EGWTPYX                 ONLINE       0     0     0
            ata-HGST_HUH728080ALE604_2EGWALNX                 ONLINE       0     0     0
            ata-HGST_HUH728080ALE604_2EGWNN1X                 ONLINE       0     0     0
            ata-HGST_HUH728080ALE604_2EGWG0BX                 ONLINE       0     0     0
            ata-HGST_HUH728080ALE604_2EGWWTGX                 ONLINE       0     0     0
          mirror-1                                            ONLINE       0     0     0
            ata-INTEL_SSDSC2BA100G3_BTTV5435005Y100FGN-part1  ONLINE       0     0     0
            ata-INTEL_SSDSC2BA100G3_BTTV54350016100FGN-part1  ONLINE       0     0     0
          ata-INTEL_SSDSC2BA100G3_BTTV5435005Y100FGN-part2    ONLINE       0     0     0
          ata-INTEL_SSDSC2BA100G3_BTTV54350016100FGN-part2    ONLINE       0     0     0
          ata-HGST_HUH728080ALE604_2EGWD3WX                   INUSE     currently in use

errors: No known data errors

As you can see, I have added the spare disk "ata-HGST_HUH728080ALE604_2EGWD3WX" via the command zpool replace zdata /dev/disk/by-id/ata-HGST_HUH728080ALE604_2EGWHSGX /dev/disk/by-id/ata-HGST_HUH728080ALE604_2EGWD3WX which has now created a spare-1 device with boths disks in it (was expecting the spare 2EGWD3WX drive to replace the dead 2EGWHSGX one.)

How do I remove the dead drive ata-HGST_HUH728080ALE604_2EGWHSGX now?

1 Answer 1


To replace a failed disk with a hot spare, you do not need to zpool replace at all (and in fact this might cause you all sorts of grief later; I've never done this). Instead you are supposed to simply zpool detach the failed disk and the hot spare automatically replaces it.

  • Good to know for the next time... (but doesn't really answer my question) Feb 2, 2019 at 20:09
  • So what happened when you did it? Feb 2, 2019 at 20:47
  • As you can see above, it made a "spare-1" device containing both the old failed and spare disks. The spare resilvered, and has "taken the place" of the old failed disk, except that now I need to remove the old failed disk from the pool. I'm just needing the correct command to do that. Feb 2, 2019 at 20:55
  • I already gave you the command to do that! Feb 2, 2019 at 20:55
  • Sorry, that wasn't clear to me... So zpool detach zdata /dev/disk/by-id/ata-HGST_HUH728080ALE604_2EGWHSGX then? Feb 2, 2019 at 21:29

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