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Doesn't really seem to make a difference which way I do it...I still see pretty intense disk I/O.
Here is some sample output from iostat in the domU:
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
xvdb 12.20 0.00 1217.40 26.20 9197.60 530.80 15.65 29.66 23.47 0.80 100.00
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
xvdb 18.40 0.00 1121.20 19.60 8737.60 691.50 16.53 32.97 29.13 0.88 100.00
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
xvdb 27.80 0.00 1241.40 29.20 8158.40 377.90 13.44 42.59 33.73 0.79 100.00
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
xvdb 31.60 0.00 1256.60 35.00 9426.40 424.00 15.25 42.06 32.44 0.77 100.00
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
xvdb 57.68 0.00 1250.50 17.76 8588.42 352.99 14.10 51.36 40.60 0.79 99.80
the avgqu-sz is anywhere from 11 to 75, and the await is anywhere from 20 to 50. %util is always around 100.
-Nick
>>> On 2009/08/26 at 12:00, Javier Guerra <javier@xxxxxxxxxxx> wrote:
On Wed, Aug 26, 2009 at 12:57 PM, Nick Couchman<Nick.Couchman@xxxxxxxxx> wrote:
> I've changed the dom0 elevator to noop and the domU to deadline.
shouldn't that be the other way around?
--
Javier
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