MatSalamon

Fantastic, thank you @JorgeB, this has resolved my issue. Appreciate your support here very much!

I certainly don't recall wiping any the the devices, they were removed from the cache pool, and then re-added without formatting. root@Phobos:~# btrfs-select-super -s 1 /dev/nvme0n1p1 using SB copy 1, bytenr 67108864 root@Phobos:~# btrfs fi show Label: none uuid: 26e0b887-b92c-4df2-ae99-87f56a96103b Total devices 2 FS bytes used 79.43GiB devid 1 size 465.76GiB used 138.03GiB path /dev/nvme1n1p1 devid 2 size 1.82TiB used 138.03GiB path /dev/nvme0n1p1 root@Phobos:~#

Hi @JorgeB, thanks for the prompt response, please see outputs below: root@Phobos:~# btrfs-select-super -s 1 /dev/nvme1n1p1 warning, device 2 is missing using SB copy 1, bytenr 67108864 root@Phobos:~# btrfs fi show warning, device 2 is missing Label: none uuid: 26e0b887-b92c-4df2-ae99-87f56a96103b Total devices 2 FS bytes used 79.43GiB devid 1 size 465.76GiB used 138.03GiB path /dev/nvme1n1p1 *** Some devices missing root@Phobos:~#

Good morning all, Hope you are well. Earlier this morning I attempted to remove a cache drive from my pool, and then re-added it but after doing so I see the following error: Unmountable: No pool uuid Any help would be greatly appreciated, as I don't want to attempt any further steps which might create an even bigger issue. root@Phobos:~# btrfs-select-super -s 1 /dev/nvme1n1 No valid Btrfs found on /dev/nvme1n1 ERROR: open ctree failed root@Phobos:~# btrfs-select-super -s 1 /dev/nvme0n1 No valid Btrfs found on /dev/nvme0n1 ERROR: open ctree failed root@Phobos:~# Thank you for your time! phobos-diagnostics-20230124-0951.zip