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Cache pool Unmountable: wrong or no file system after ram went bad

JoshHuman
in General Support

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My unraid server became unusable late monday night, cache pool stopped working so I rebooted Tuesday when I noticed. Everything came up fine, but then went down again today with the same issue (BTRFS error (device nvme1n1p1): tree first key mismatch detected). This led me to realize I had a RAM issue, so after memtesting, 2 of my 4 sticks were bad, pulled them, tested for a couple more hours with no errors and booted back up. Only for my cache pool to be Unmountable: wrong or no file system. Booted into maintenance mode and did a btrfs check and all seems good, but the drives are unmountable.

Am I sol, or is btrfs check --repair an option for me?

Screenshot 2026-10-21 at 20.37.36.png

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