On 2010-01-27, at 06:06, Andre Noll wrote:
On 11:19, bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote:
After kill -9 of the sync run it took about 20 minutes before
it died.
I was seeing similar behaviour on one of our servers, and changing
the io scheduler to noop fixed things for me. So it seems to be an
issue with cfq which is somehow triggered by ext4 but not by ext3.
To change the IO scheduler, just execute
echo noop > /sys/block/sda/queue/scheduler
Andre, could you please also test deadline instead of noop? In
general, deadline has nearly the same IO behaviour as noop, but still
allows simple request merging and is generally a better option than
noop.
Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
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