2011-05-21 14:58:21 +0200, Tomasz Chmielewski:
> I have a btrfs filesystem (2.6.39) which is mounted, but otherwise, not used:
> 
> # lsof -n|grep /mnt/btrfs

processes with open fds are one thing. You could also have loop
devices setup on it for instance.

> #
> 
> 
> I noticed that whenever I do "sync", btrfs will write for around 6.5s and 
> write 13 MB (see below).
[...]

You could try and play with /proc/sys/vm/block_dump to see what
is being written (remember to disable logging of kernel messages
by syslog).

-- 
Stephane
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