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I have a ZPool consisting in two drives in a mirror configuration. It seems that during server manteinance (cleaning), one of the drives went offline because the wiring came lose.

# zpool status -v zmsmall1
  pool: zmsmall1
 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: https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-4J
  scan: scrub repaired 0B in 02:00:24 with 0 errors on Sun Apr 14 02:24:25 2024
config:

    NAME                                  STATE     READ WRITE CKSUM
    zmsmall1                              DEGRADED     0     0     0
      mirror-0                            DEGRADED     0     0     0
        ata-ST1000NM0033-9ZM173_Z1W074QR  ONLINE       0     0     0
        16687432235547222567              UNAVAIL      0     0     0  was /dev/disk/by-id/ata-TOSHIBA_MG03ACA100_93S2K8CZF-part1




errors: No known data errors

Unfortunately there was no notification on the problem. After 4 days I detected the problem and now I have doubts on how to proceed. My concern is that the online drive as been receiving data during this past days and drifted from the 2nd drive status. I fear that simply bringing back the second drive and issuing a zpool clear zmsmall1 could mess the good data on the first drive.

How I should proceed for a safe recovery? PS: I'm already doing a second backup, but I would prefer to solve the situation (for practicing) instead of bringing up a new pool.

Sergio
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1 Answers1

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I finally took the risk and re-connected the offline drive.

As storsan commented, the pool inmediately changed to an OK state and a resilvering process for the "outdated" drive started inmediately. The error was still showing in zpool status, but it clearly said that it was all Ok with the pool. So I issued a zpool clear zmsmall1, the error history cleared and there was no clue that there was an error.

# zpool status zmsmall1
  pool: zmsmall1
 state: ONLINE
  scan: resilvered 1.07G in 00:00:40 with 0 errors on Sat May 18 21:10:16 2024
config:

    NAME                                  STATE     READ WRITE CKSUM
    zmsmall1                              ONLINE       0     0     0
      mirror-0                            ONLINE       0     0     0
        ata-ST1000NM0033-9ZM173_Z1W074QR  ONLINE       0     0     0
        ata-TOSHIBA_MG03ACA100_93S2K8CZF  ONLINE       0     0     0




errors: No known data errors
Sergio
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