High IO wait with little reason 2006-02-20 - By Ed Wilts
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On Mon, Feb 20, 2006 at 06:08:12AM -0600, Benji Spencer wrote:
> using iostat on the PowerPath disks always seem be activity -- even when
> there isn't. Example is below. It will go minutes with these same results
> and no changes...
Since PowerPath does load balancing, is it possible that what you're
seeing is just I/O to the frame to determine the service time in advance
of real I/O? That way PowerPath would know which path to use if you
suddenly started doing I/O.
You should log a call with EMC to get some answers. As Arjan from Red
Hat has said several times here "they have our source - we don't have
theirs".
.../Ed
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Ed Wilts, RHCE
Mounds View, MN, USA
mailto:ewilts@(protected)
Member #1, Red Hat Community Ambassador Program
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