On Apr 4, 2014, at 12:03 AM, François Beausoleil <francois(at)teksol(dot)info> 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.