I woke up to a cache pool error this morning. I’ve had no updates to my knowledge. The pool is formatted in btrfs with 2 nvme drives: nvme0n1& nvme1n1. My diagnostics is below.

Error is the cache pool ‘Unmountable: wrong or no file system’

Thanks for any help.

tower-diagnostics-20250909-1143.zip

Type btrfs rescue zero-log /dev/nvme0n1p1 then restart the array and post new diags.

That allowed it to be built to mounted and it looks like everything is working correctly. The only weird thing is now my appdata, domain, and system shares show their primary storage is now set to another single disk pool I have called Main. I’m not exactly sure how to move forward?If you have any suggestions on how I could prevent this from happening again I would appreciate them. Here is the updated diagnostics. Thanks for the help JorgeB.

tower-diagnostics-20250910-0949.zip

Edited September 10, 2025Sep 10 by redstang91

Pool looks OK for now; take the opportunity to make sure the backups are up to date.

Note that this issue can sometimes reoccur; if that happens soon, the command should work again, but then recommend backing up and reformatting the pool.

That was my plan if I could get any data off the current pool. I have everything backed up except a new home assistant vm I wanted to try to keep.

Thanks for the prompt help.