Hi
I am doing a scrub on my 6-drive btrfs RAID6. Last time it found zero
errors, but now I am getting this in my log:
[ 6610.888020] BTRFS: checksum error at logical 478232346624 on dev
/dev/dm-2, sector 231373760: metadata leaf (level 0) in tree 2
[ 6610.888025] BTRFS: checksum error at logical 478232346624 on dev
/dev/dm-2, sector 231373760: metadata leaf (level 0) in tree 2
[ 6610.888029] BTRFS: bdev /dev/dm-2 errs: wr 0, rd 0, flush 0, corrupt 1, gen 0
[ 6611.271334] BTRFS: unable to fixup (regular) error at logical
478232346624 on dev /dev/dm-2
[ 6611.831370] BTRFS: checksum error at logical 478232346624 on dev
/dev/dm-2, sector 231373760: metadata leaf (level 0) in tree 2
[ 6611.831373] BTRFS: checksum error at logical 478232346624 on dev
/dev/dm-2, sector 231373760: metadata leaf (level 0) in tree 2
[ 6611.831375] BTRFS: bdev /dev/dm-2 errs: wr 0, rd 0, flush 0, corrupt 2, gen 0
[ 6612.396402] BTRFS: unable to fixup (regular) error at logical
478232346624 on dev /dev/dm-2
[ 6904.027456] BTRFS: checksum error at logical 478232346624 on dev
/dev/dm-2, sector 231373760: metadata leaf (level 0) in tree 2
[ 6904.027460] BTRFS: checksum error at logical 478232346624 on dev
/dev/dm-2, sector 231373760: metadata leaf (level 0) in tree 2
[ 6904.027463] BTRFS: bdev /dev/dm-2 errs: wr 0, rd 0, flush 0, corrupt 3, gen 0
Looks like it is always the same sector.
"btrfs balance status" shows me:
scrub status for a34ce68b-bb9f-49f0-91fe-21a924ef11ae
scrub started at Thu May 28 02:25:31 2015, running for 6759 seconds
total bytes scrubbed: 448.87GiB with 14 errors
error details: read=8 csum=6
corrected errors: 3, uncorrectable errors: 11, unverified errors: 0
What does it mean and why are these erros uncorrectable even on a RAID6?
Can I find out, which files are affected?
system: Ubuntu 14.04.2
kernel version 4.0.4
btrfs-tools version: 4.0
Regards
Tobias
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