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ZFS Failed Disk Replacement

Identify the problem drive and location exactly before replacing!

Power the server off when manipulating disk drives, if at all possible.

The normal replacement procedure involves fixing the pool first, then removing the failed drive. Replace in-place if you must.

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Replace with spare:

Degraded → Offline → Replace

Replace in-place drive:

Degraded → Offline → Remove → Pull Bad Drive → Install New Drive → Initialize → Add to VDEV

Wait for the resilvering to finish then run a scrub job.

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Replace a Failed Drive: https://www.thegeekdiary.com/solaris-zfs-how-to-offline-online-detach-replace-device-in-a-storage-pool/

Use zpool replace to replace a failed drive. It is safest to replace a failed drive with another existent drive in another slot.

zpool replace <poolname> <faileddisk> <newdisk>

To replace a failed drive by replacing it in-place, it is best to shut down the server, remove and replace the failed drive, the use zpool replace specifying only the drive being replaced.

zpool replace <poolname> <disk>

zpool detach will remove a drive from a VDEV, turning a mirrored VDEV into a single drive VDEV. Use zpool attach to recreate the mirror. In general, do not use these commands to replace a failed drive.

Replace Old Drives With New or Bigger: https://www.thegeekdiary.com/solaris-zfs-how-to-offline-online-detach-replace-device-in-a-storage-pool/

It is safest to zpool attach an additional mirror to a mirrored VDEV (which adds redundancy) then remove the drive being upgraded afterwards.

zpool attach <poolname> <existingvdevmember> <newdrive>
# Wait for it to resilver, which adds redundancy
zpool detach <poolname> <drivebeingreplaced>

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