I had to replace my PS a few weeks back and with that came some new fans and rerouting of sata cables.  All cables were placed as they should be and mapped back to the original ports.  Now when my cache pool starts, it shows the full size of the pool and all vm's start fine, but the second drive shows as not mounted and can be mounted in the unassigned drives plugin.

 

Any thoughts?

10 minutes ago, ichbinpete said:

but the second drive shows as not mounted

The pool info is always for the complete pool in the cache1 line, all other cache devices show nothing, if it's not that post your diagnostics.

This is what I am seeing:

Am I reading this right, that there is one drive (it's 120GB) but it's showing 240GB

  

 

And this is the missing SSD showing in unassigned devices.

 

Also attached my diag files

thetp-nas-diagnostics-20180227-1526.zip

Both devices are still part of the pool, despite one of them being unassigned:

 

Data,single: Size:210.97GiB, Used:209.77GiB
   /dev/sdd1     102.00GiB
   /dev/sde1     108.97GiB

If you assign both devices does the pool not mount? if not post new diags after trying, but if there's any important data on the pool better to backup first just in case it gets worse.

When i tried to assign it, it wanted to format it first.  any way around that?

 

 

Since you're using the single profile instead of the default raid1 you can't just remove and re-add the problem device, you'll need to backup your cache, reformat the pool and restore the data, you can use this to help with the backup/restore:

 

https://lime-technology.com/forums/topic/46802-faq-for-unraid-v6/?do=findComment&comment=511923