Attach the missing device and online it using 'zpool online'.

[Ptera]

I have struggled with this for a few days now...
Build FreeNAS-9.2.1.8-RELEASE-x64 (e625626)
Platform Intel(R) Xeon(R) CPU E3-1230 V2 @ 3.30GHz
Memory 16335MB

Checking status of zfs pools:
NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT
PteraNas2 7.25T 208M 7.25T 0% 1.00x ONLINE /mnt

pool: PteraNas2
state: ONLINE
status: One or more devices could not be opened. Sufficient replicas exist for
the pool to continue functioning in a degraded state.
action: Attach the missing device and online it using 'zpool online'.
see: http://illumos.org/msg/ZFS-8000-2Q
scan: scrub repaired 0 in 0h0m with 0 errors on Sun Oct 26 00:00:35 2014
config:

NAME STATE READ WRITE CKSUM
PteraNas2 ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
gptid/684206c2-128f-11e4-8cdf-0cc47a0b6ccd ONLINE 0 0 0
gptid/690e5036-128f-11e4-8cdf-0cc47a0b6ccd ONLINE 0 0 0
mirror-1 ONLINE 0 0 0
gptid/69df2b6a-128f-11e4-8cdf-0cc47a0b6ccd ONLINE 0 0 0
gptid/6aa9c429-128f-11e4-8cdf-0cc47a0b6ccd ONLINE 0 0 0
cache
10221381409500812197 UNAVAIL 0 0 0 was /dev/gptid/7a33ccad-136f-11e4-a360-0cc47a0b6ccd
gptid/b14ad00f-65d4-11e4-b95c-0cc47a0b6ccd ONLINE 0 0 0

errors: No known data errors

I have tried to fix this ever since I had to replace the USB thumb drive for this unit.
I tried to follow the instructions at http://illumos.org/msg/ZFS-8000-2Q
I guess it is the cache drive I am unable to get back into the pool.

Help...

 

[Ptera]

I think I figured it out with...

zpool remove PteraNas2 10221381409500812197

Will find out tomorrow if I do not get the error again.

 

[cyberjock]

You know, if you read the manual it tells you how to *properly* remove disks from the pool. /smh