 | | | High IO wait with little reason | High IO wait with little reason 2006-02-20 - By Scott Wellnitz (swellnit)
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Ask EMC to run symmtop on the frame during your "backup" windows to
identify physical drive hot-spots within the array.
That should not require anything from the host side (including down
time).
-- --Original Message-- --
From: taroon-list-bounces@(protected)
[mailto:taroon-list-bounces@(protected)] On Behalf Of Benji Spencer
Sent: Monday, February 20, 2006 7:56 AM
To: Discussion of Red Hat Enterprise Linux 3 (Taroon)
Subject: Re: High IO wait with little reason
Thanks Ed...
You could be right. We have/will open a case with EMC, but they tend to
be less then useful and don't ever seem to deal with anything if we are
not on the absolute latest version of everything....while I understand
why, that isn't helpful when dealing with these types of problems we
then need to schedule down time to try to perform the updates.
Benji
>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
>
>--
>Ed Wilts, RHCE
>Mounds View, MN, USA
>mailto:ewilts@(protected)
>Member #1, Red Hat Community Ambassador Program
>
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>Taroon-list mailing list
>Taroon-list@(protected)
>https://www.redhat.com/mailman/listinfo/taroon-list
---
Ben Spencer
ben.spencer@(protected)
312-329-2288
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