Le 2014-04-04 à 08:11, Ray Stell a écrit : > > On Apr 4, 2014, at 12:03 AM, François Beausoleil <francois@xxxxxxxxxxx> wrote: > >> I have some performance issues on a Ubuntu 12.04 which I'd like to resolve. iowait varies a lot, between 5 and 50%. > > Is the SAN dedicated to this app? I wonder if the i/o, if not related to your app, is being pressed by some other system/s that are also on the SAN? You'll need to relate the wait events to your activities. I've been squeezed like that in the past. There are no SAN: it's a dedicated machine, dedicated hardware. As John Pierce guessed, having more disks would help. I should probably look more towards that than switching OS. Thanks! François
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