On Dienstag, 26. Oktober 2010 Emmanuel Florac wrote:
> echo "noop" > /sys/block/sdc/queue/scheduler
> echo 512 > /sys/block/sdc/queue/nr_requests
> blockdev --setra 4096 /dev/sdc
How about this small script in /etc/init.d/boot.local?
for i in /dev/xvd? /dev/sd? ; do
if test "$i" == "${i%\?}" ; then
echo i=$i
blockdev --setra 1024 $i
j=${i#/dev/}
echo j=$j
echo noop >/sys/block/$j/queue/scheduler
echo 512 >/sys/block/$j/queue/nr_requests
fi
done
This works for VMs within XenServer (/dev/xvda) and real servers
(/dev/sda), and sets some values for all drives.
BTW: any recommendations for these tuning knobs on VM-ized servers? What
should be set in the VMs and what on the host? Has someone got tested
numbers? I'm currently testing things, but it's so damn hard to get any
useful, reliable results.
--
mit freundlichen Grüssen,
Michael Monnerie, Ing. BSc
it-management Internet Services
http://proteger.at [gesprochen: Prot-e-schee]
Tel: 0660 / 415 65 31
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