Hello!
I am trying to figure out how to recover from errors detected by btrfs scrub.
Scrub status reports:
scrub status for 4f4479d5-648a-45b9-bcbf-978c766aeb41
scrub started at Mon Oct 15 10:02:28 2018, running for 00:35:39
total bytes scrubbed: 791.15GiB with 18 errors
error details: csum=18
corrected errors: 0, uncorrectable errors: 18, unverified errors: 0
Kernel log contains lines like
BTRFS warning (device dm-8): checksum error at logical 7351706472448 on dev
/dev/mapper/disk6tb, sector 61412648, root 12725, inode 152358265,
offset 483328:
path resolving failed with ret=-2
I've tried so far:
- deleting the files (when path is visible)
- overwriting the files with new data
- changed disk (with btrfs replace)
The checksum errors however persist.
How do I get rid of them?
The files are logs and other non-vital information. I am fine by
deleting the corrupted files. It is OK to recover so that I loose a
few gigabytes of data, but not the entire filesystem.
Setup is a multi-disk btrfs filesystem, data single, metadata RAID-1
Mounted with:
/dev/mapper/wdc3td on /data type btrfs
(rw,noatime,compress=lzo,space_cache,subvolid=5,subvol=/)
I've read lots of online sources on the topic but none of these help
me on how to recover from the current state:
https://btrfs.wiki.kernel.org/index.php/Btrfsck
http://marc.merlins.org/perso/btrfs/post_2014-03-19_Btrfs-Tips_-Btrfs-Scrub-and-Btrfs-Filesystem-Repair.html
https://wiki.archlinux.org/index.php/Identify_damaged_files#Find_damaged_files
