On Mon, Apr 08, 2019 at 11:48:03AM -0400, Scott E. Blomquist wrote:
> 
> Hi All,
> 
> The weekend btrfs scrub/balance came back with this following...
> 
> [Sun Apr  7 06:57:10 2019] BTRFS warning (device sdb1): checksum error at logical 274820497408 on dev /dev/sda1, sector 536758784, root 271471, inode 109421914, offset 491520, length 4096, links 1 (path: yyyy/yyyyy)
[snip]

   Since there doesn't seem to be anything else wrong (no messages
without a filename, which would imply metadata corruption), this is
most likely a simple case of on-device corruption.

   Delete yyyy/yyyyy and restore it from backups. At least, do so in
the working copy; The snapshots of it can safely remain until they get
rotated out normally.

   Check your SMART statistics and see if anything looks wrong there
on the hardware side. Also check dmesg and earlier kernel logs for
signs of the hardware showing an error on read -- it may have tried
several times to read that location before giving up and/or returning
bad data.

   Hugo.

> 
> Here is what I have...
> 
>     root@cbmm-fsb:~# uname -a
>     Linux cbmm-fsb 4.14.24-custom #1 SMP Mon Mar 5 10:10:39 EST 2018 x86_64 x86_64 x86_64 GNU/Linux
>     
>     root@cbmm-fsb:~# btrfs --version
>     btrfs-progs v4.15.1
>     
>     root@cbmm-fsb:~# btrfs fi show
>     Label: none  uuid: d83b1e28-db27-4035-8638-d4b2eb824ff2
>            Total devices 2 FS bytes used 80.09TiB
>            devid    1 size 76.40TiB used 62.49TiB path /dev/sda1
>            devid    2 size 32.74TiB used 18.83TiB path /dev/sdb1
>     
>     root@cbmm-fsb:~# btrfs fi df /home/cbcl
>     Data, single: total=79.80TiB, used=79.80TiB
>     System, RAID1: total=32.00MiB, used=9.09MiB
>     Metadata, RAID1: total=757.00GiB, used=281.34GiB
>     Metadata, DUP: total=22.50GiB, used=19.27GiB
>     GlobalReserve, single: total=512.00MiB, used=0.00B
>     
> sda and sdb are megaraid raid6 with BBU and both are optimal.
> 
> Any tips?  Thanks.
> 
> sb. Scott Blomquist
> 

-- 
Hugo Mills             | If it ain't broke, hit it again.
hugo@... carfax.org.uk |
http://carfax.org.uk/  |
PGP: E2AB1DE4          |                                                  Foon