March 21, 20233 yr I made a mistake thinking I could reduce my cache pool size and removed two drives and then restarted the array. This resulted in a now obvious messaging saying two many disks missing and that the pool was unmountable. I added the drives back in the same order and restarted the array but have the same error message. Is it possible to restore my pool or do I need to manually pull of the files from one of the drives and then rebuilt the pool? Diagnostic files attached. buellvault-diagnostics-20230320-2130.zip
March 23, 20233 yr Author Sorry for the delay - was traveling. Output is below bad tree block 2386712559616, bytenr mismatch, want=2386712559616, have=0 Couldn't read tree root Label: none uuid: b242ecb7-0712-4962-8ae2-ac3d49ad64fd Total devices 4 FS bytes used 142.30GiB devid 3 size 465.76GiB used 82.03GiB path /dev/sdb1 devid 4 size 465.76GiB used 82.03GiB path /dev/sde1 *** Some devices missing
March 23, 20233 yr Author THis is the output after I start the array: root@BuellVault:~# btrfs fi show Label: none uuid: 19173620-859f-437e-b39c-fbe64123cf0a Total devices 1 FS bytes used 348.00KiB devid 1 size 1.00GiB used 126.38MiB path /dev/loop2 bad tree block 2386712559616, bytenr mismatch, want=2386712559616, have=0 Couldn't read tree root Label: none uuid: b242ecb7-0712-4962-8ae2-ac3d49ad64fd Total devices 4 FS bytes used 142.30GiB devid 3 size 465.76GiB used 82.03GiB path /dev/sdb1 devid 4 size 465.76GiB used 82.03GiB path /dev/sde1 *** Some devices missing
March 23, 20233 yr Stop the array and post output of: btrfs-select-super -s 1 /dev/sdc1 and btrfs-select-super -s 1 /dev/sdd1
March 23, 20233 yr Author Output below: root@BuellVault:~# btrfs-select-super -s 1 /dev/sdc1 using SB copy 1, bytenr 67108864 root@BuellVault:~# btrfs-select-super -s 1 /dev/sdd1 using SB copy 1, bytenr 67108864 root@BuellVault:~#
March 23, 20233 yr On 3/21/2023 at 9:13 AM, JorgeB said: Post the output of: btrfs fi show again please
March 23, 20233 yr Author root@BuellVault:~# btrfs fi show Label: none uuid: b242ecb7-0712-4962-8ae2-ac3d49ad64fd Total devices 4 FS bytes used 142.30GiB devid 1 size 447.13GiB used 63.00GiB path /dev/sdc1 devid 2 size 447.13GiB used 63.00GiB path /dev/sdd1 devid 3 size 465.76GiB used 82.03GiB path /dev/sdb1 devid 4 size 465.76GiB used 82.03GiB path /dev/sde1 root@BuellVault:~#
March 23, 20233 yr Solution OK, now with array stopped, unassign all devices from that pool, start array, stop array, re-assign all 4 pool devices, start array, post new diags if it doesn't mount.
March 23, 20233 yr Author You are amazing! The pool has been restored. Going to make a fresh backup of everything now!
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