在 2021-04-14星期三的 06:32 -0500，Richard Shaw写道：
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.
Seems that the filesystem is still mountable, so before doing anything, you should backup files there in case it can gets worse.
Btrfs scrub checks for checksum mismatch and the error you see during balancing is due to that your filesystem is in a inconsistent state, repair tools may help but I don't suggest you run fix now, before getting advices from btrfs experts, since using repair tools blindly may break things in some cases.
There are some btrfs experts here in this list but posting your problem in linux-btrfs@vger.kernel.org may get quicker response.
Thanks, Richard _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-leave@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en- US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject .org Do not reply to spam on the list, report it: https://pagure.io/fedora- infrastructure