wait io and SAN

From: Samier.Kesou@bfa.de
Date: Wed Feb 12 2003 - 07:38:22 EST

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Hello,

we have a 12 CPU Server with a oracle database running on it
OS: 5.8
oracle:8.1.7
SAN: EMC Symmetrix
HBA: Emulex
when running batch jobs we experience high values of wait io
on all CPU's (20 - 60 % using mpstat). The amount for every single CPU is
about the same.
Performance checks on the SAN side didn't show any performance
problems.

I would have thought that SAN disks would have a better performance than
that.
Has anyone a similar experience or information about finding the cause
of the wait io?

thanks in advance,
Samier.
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