Re: btrfs csum failed

[Martin Schitter <ms@mur.at>]

Am 2011-05-04 04:18, schrieb Fajar A. Nugraha:
>> could you give me some advice how to debug/report this specific
>> problem more
>>> precise?
> If it's not reproducible then I'd suspect it'd be hard to do.

the last working snapshot is from 2011-05-02-17:13. i can reproduce this 
file system corruption on one specific file in any hourly snapshot later.

whenever i make a simple:

   cat snapshot-2011-05-02-18:13/sata-images/image_xy.raw > /dev/null

i get an "Input/output error" and the quoted debug messages in dmesg and
kernel-log

could this be seen as an useful starting point for further investigations?

> Usually checksum errors is early sign of hardware failure (most
> common are disk or power supply).

that looks very unplausible to me. there is an RAID1 layer beneath btrfs 
in our setup and i don't see any errors there.

and the 'nodatasum' option should also ignore csum issues.-- isn't it?

martin