Remove Missing Drives from ZFS Pool

Question

After an embarrassing session trying to replace a disk in my ZFS pool, I have a bunch of entries representing disks that are no longer present in the system:

NAME                        STATE     READ WRITE CKSUM
  data                        DEGRADED     0     0     0
    mirror-0                  DEGRADED  141K     0     0
      replacing-0             UNAVAIL      0     0     0  insufficient replicas
        15005414211141553750  UNAVAIL      0     0     0  was /dev/sdb2
        3582694243925899896   UNAVAIL      0     0     0  was /dev/disk/by-path/pci-0000:00:1f.2-ata-3-part1
      sda                     ONLINE       0     0  141K
    mirror-1                  ONLINE       0     0     0
      sdc                     ONLINE       0     0     0
      sdd                     ONLINE       0     0     0

How can I get rid of the disks listed as replacing-0? Once this is cleared I should be able to correctly add the new disk to the system and run the replace command to resilver.

A zpool replace fails:

user@server:~$ sudo zpool replace data 3582694243925899896 /dev/disk/by-id/ata-ST16000NM001G-2KK103_ZL2KGLN4
cannot replace 3582694243925899896 with /dev/disk/by-id/ata-ST16000NM001G-2KK103_ZL2KGLN4: /dev/disk/by-id/ata-ST16000NM001G-2KK103_ZL2KGLN4 is busy, or device removal is in progress

A zpool detach also fails:

user@server:~$ sudo zpool detach data 3582694243925899896
cannot detach 3582694243925899896: no valid replicas

score 0 · Answer 1 · answered Jan 27 '22 at 02:40

You're mixing terms, and this could lead to the pool corruption/destruction. So you have a spen comprising two mirrors, and one mirror is degraded because the disk died.

you should replace the failed drive if first mirror. Actually, both of them, the original drive that died and the replaced drive that for some reason is also missing (died ? weird). This can be done with one step.
you could detach the failed drive from mirror (but I don't see why you should)
you don't add the drive to the pool, you attach it to the mirror in case you detached one disk form first span mirror block.

I've updated the original question around `replace` & `detach` as that gives me errors. I tried the add command but I couldn't get the right syntax, do you have an example of how that should work? — Danny Roberts, Jan 28 '22 at 14:15

Remove Missing Drives from ZFS Pool

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