Searched similar posts across reddit and forums, but I'm out of ideas/depth.

Upgraded to 7.1.2 from 7.0.1 and now cache shows as Unmountable: Unsupported file system. I tried stopping the array, removing the cache drive, removing the pool, starting the array back up, stopping the array, and adding the pool and cache drive back in, and starting the array again, but that did not work. Tried booting in safe mode, shut off turn back on again, the classics, I got nothing.

Anyone have any ideas? All other drives appear fine (Ignore disk 12 failure, i need go replace that drive one day)

I have appdata backup plugin, should I just format the drive and restore my appdata folder (only other thing on cache drive was VM isos). Im fine if I lose my VMs, didnt really have anything important on there anyway. Maybe I should downgrade my OS back to 7.0.1, lemme know.

Edit:

Tried starting the array in Maint Mode and ran xfs_repair on the cache drive with the -n option. Could not find primary, and could not find secondary block.

altair-diagnostics-20250531-1315.zip

Edited June 1, 20251 yr by T_P
Additional Troubleshooting Attempted

The partition is not being correctly detected, post the output from:

wipefs /dev/sdb

This won't wipe anything, as written

Got the following.

That old ddf_raid signature is likely the problem, type wipefs -a -t ddf_raid_member /dev/sdb

Then post new diags after array start

Seems to have fixed the issue. Thank you for your help.

My dockers and VMs are all gone, while still being in appdata, but I will google/reddit around before making another post about that issue.

Posting the diagnostics anyway just in case I missed anything.

altair-diagnostics-20250602-0640.zip

New images were likely created when the array was started without the pool, change the paths for both services to /mnt/cache instead of /mmt/user, if they come back you can delete the files from the array.

Thank you @JorgeB !

All is back up and running. Appreciate your assistance.