I have been running a 3 disk RAID 1 btrfs array for a few weeks now and simulated more than a dozen power failures without issue. Yesterday I decided to add my 4th disk, which was the original media drive.
I was able to add it to the array easy enough and then initiated a full balance, however, when I was trying to squeeze the case panels back on (SATA power cables are stiff!) two of the drives (sdc, sdd) lost power. I didn't notice the problem for a few minutes until I looked at the storage section of Cockpit. I immediately initiated a shutdown and corrected the issue by rerouting the power cables a bit. After booting back up I tried to restart the balance but it would run briefly and then stop. dmesg shows: [ 155.497940] BTRFS info (device sdc): balance: start -d -m -s [ 155.499804] BTRFS info (device sdc): relocating block group 10451967541248 flags data|raid1 [ 162.517172] BTRFS info (device sdc): found 15 extents, stage: move data extents [ 162.776081] BTRFS error (device sdc): tree level mismatch detected, bytenr=10359313989632 level expected=0 has=2 [ 162.776087] BTRFS error (device sdc): tree level mismatch detected, bytenr=10359313989632 level expected=0 has=2 [ 162.776090] BTRFS error (device sdc): tree level mismatch detected, bytenr=10359313989632 level expected=0 has=2 [ 162.855784] BTRFS info (device sdc): balance: ended with status: -117 I ran a scrub and a little over 5 hours later it shows it made 4 corrections: # btrfs scrub start -B /mnt/media scrub done for d9a2a011-77a2-43be-acd1-c9093d32125b Scrub started: Tue Apr 13 17:09:51 2021 Status: finished Duration: 5:20:52 Total to scrub: 7.34TiB Rate: 399.47MiB/s Error summary: verify=4 Corrected: 4 Uncorrectable: 0 Unverified: 0 WARNING: errors detected during scrubbing, corrected However, when I try to balance again I still get errors: [19480.281381] BTRFS info (device sdc): balance: start -d -m -s [19480.298196] BTRFS info (device sdc): relocating block group 10451967541248 flags data|raid1 [19485.587630] BTRFS info (device sdc): found 15 extents, stage: move data extents [19485.801278] BTRFS error (device sdc): tree level mismatch detected, bytenr=10359313989632 level expected=0 has=2 [19485.801287] BTRFS error (device sdc): tree level mismatch detected, bytenr=10359313989632 level expected=0 has=2 [19485.801288] BTRFS error (device sdc): tree level mismatch detected, bytenr=10359313989632 level expected=0 has=2 [19485.865739] BTRFS info (device sdc): balance: ended with status: -117 Where do I go from here? Googling "tree level mismatch detected" shows mostly source code results. Thanks, Richard
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