zfs zpool status DEGRADED pfSense Plus 23.05

[AMG A35]

Re: zfs zpool status DEGRADED - correct procedure to replace the failed disk ?

I have a Protectli FWD6C running pfSense Plus 23.05 with a zfs mirror. Today one of the SSD in the mirror failed.

zpool status gives:

pool: pfSense
state: DEGRADED
status: One or more devices has been removed by the administrator.
   Sufficient replicas exist for the pool to continue functioning in a
   degraded state.
action: Online the device using zpool online' or replace the device with
   'zpool replace'.
config:

   NAME        STATE     READ WRITE CKSUM
   pfSense     DEGRADED     0     0     0
     mirror-0  DEGRADED     0     0     0
       ada0p3  ONLINE       0     0     0
       ada1p3  REMOVED      0     0     0

errors: No known data errors

This is different to the response in the earlier thread on this subject as it refers to a 'zpool replace' option. I can't find any pfSense documentation on this, but this link Replacing a Device in a ZFS Storage Pool suggests there may be a simpler way to replace a defective drive.

Has anyone used this option please?

[cmcdonald]

@AMG-A35 There is currently no GUI tool for replacing failed drives (It is on my list of to-dos). You will have to zfs-replace(8) at the command line. I would suggest reading the FreeBSD specific man page https://man.freebsd.org/cgi/man.cgi?query=zpool-replace&apropos=0&sektion=8&manpath=FreeBSD+14.0-CURRENT&arch=default&format=html

[AMG A35]

@cmcdonald thanks, I'll give that a try

[tedquade]

@AMG-A35 I employed the following with success. It was suggested by Steve Wheeler.

https://farrokhi.net/posts/2020/05/replacing-a-faulty-disk-in-zfs/

Ted Quade

[AMG A35]

@tedquade Thanks for that, extremely helpful.

I did not anticipate replacing a zfs mirror would not be a documented and supported procedure. I can't risk router being offline, so I've got a replacement unit coming today and I'll try that recovery when the current unit is offline.