cache will not go zpool online

[Ptera]

[root@nas2 ~]# zpool status -x
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
7943533397318142647 UNAVAIL 0 0 0 was /dev/gptid/b14ad00f-65d4-11e4-b95c-0cc47a0b6
ccd
gptid/47fff80c-6b94-11e4-9f2a-0cc47a0b6ccd ONLINE 0 0 0

errors: No known data errors
[root@nas2 ~]# zpool online PteraNas2 7943533397318142647
cannot online 7943533397318142647: cannot expand cache devices
[root@nas2 ~]#
I have no clue what to do here...

 

[dlavigne]

Have you tried replacing the device using the instructions in the Manual for your version of FreeNAS?

 

[Ptera]

There was no physical device replaced. It is the same sold state drive that has been there since the build.

 

[Ptera]

What I need is how to determine which drive is what. I have a 16Gig Solid state drive and a 16Gig USB.
FreenNAS only identified the device as 16GBC0062522 - not much help there.

The issues we had before was there was a FreeNAS OS on both so it would boot from the USB but run from the Solid State Drive.
I removed the partition from the SSD and re-imaged the USB and then restored the backup config.
My concern is that there is something bad in the config that I reloaded that is causing the drives to flip again.
So if I go to add the SSD as a cache drive I will actual end up adding the USB imaged drive instead.
I would really like to use a command like hdparm to make sure which 16G drive is actually being seen as an available drive to add as the cache.

 

[Ptera]

camcontrol devlist

 

[Ptera]

Thanks