I'm running a raidz2 pool on Linux Mint 19.x. I'm seeing the following in the pool status:

david@Media:~$ zpool status pool: data 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: resilvered 1.27T in 8h15m with 0 errors on Tue Nov 26 09:53:36 2019 config:

NAME                      STATE     READ WRITE CKSUM
data                      DEGRADED     0     0     0
  raidz2-0                DEGRADED     0     0     0
    sdb                   ONLINE       0     0     0
    sdc                   ONLINE       0     0     0
    sdd                   ONLINE       0     0     0
    sde                   ONLINE       0     0     0
    10841317365380570418  UNAVAIL      0     0     0  was /dev/sdf1
    sdh                   ONLINE       0     0     0
    sdi                   ONLINE       0     0     0
    sdj                   ONLINE       0     0     0

If I look at the disks there is no longer a drive at /dev/sdf but there is one at /dev/sdg. I don't think I want to run the "replace" command mentioned in the status as my understanding that is destructive and will resliver the data onto sdg which I believe is the missing sdf.

How can I swap out sdg for sdf or cachieve something similar without destroying the pool data on sdg?

I looked around for information on this message but wasn't finding much useful or that I could understand. I saw references to mdadm, but that does not seem to be my problem;

david@Media:~$ cat /proc/mdstat Personalities : unused devices:

1 Answer 1


You should avoid using generic SCSI /dev/sdX names for your ZFS pool devices because they can change across boots. I prefer using entries from /dev/disk/by-id

In this case, you can probably replace the missing disk with the new device location:

zpool replace data 10841317365380570418 sdg
  • 1
    Thanks. As a beginner with ZFS, I was just following easy tutorials which don't always follow best practices. I was wondering about the sdX names changing. I did; "zpool export [zpoolname]" then "zpool import -d /dev/disk/by-id [zpoolname]" which seems to have gotten the disk back in the pool and given me disk ids now in zpool status, but not sure if that will stick on reboot.
    – Aladdin
    Dec 2, 2019 at 6:52
  • That works too!
    – ewwhite
    Dec 2, 2019 at 7:14

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.