[Bug 483569] Re: kjournald2 writing to disk every few seconds

[VladV]

I can confirm the bug too.

2.6.31-20-generic-pae #58-Ubuntu SMP Fri Mar 12 06:25:51 UTC 2010 i686
GNU/Linux

After enabling(block operations debugging (echo 1 > /proc/sys/vm/block_dump) I see lots of messages like these in kern.log:
[1052950.193581] pdflush(45): WRITE block 26266552 on md2
[1052950.193589] pdflush(45): WRITE block 26266560 on md2
[1052959.538915] kjournald2(724): WRITE block 26266560 on md2
[1052959.538951] kjournald2(724): WRITE block 26262472 on md2

md2 is a software RAID partition formatted as ext4 and mounted as /.
Another ext4 partition is mounted as /home and is occasionally written to by kjournald2, though much less frequently.

After remounting root partion with increased commit delay (/etc/fstab:
/dev/md2  /  ext4  defaults,noatime,errors=remount-ro,commit=15  0  0)
the disk activity ceased significantly.

I guess, the activity is caused by the daemon flushing ext4 journal,
though I wonder what it writes there that often.

-- 
kjournald2 writing to disk every few seconds
https://bugs.launchpad.net/bugs/483569
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