sujata.mutatkar@eddiebauer.com wrote:
> I have a question here.
> We have E10K with Solaris 2.6 and oracle 8.1.6.
> Major Software we run on it are SAS , oracle and Netbackup server
> software. We see Idle time going to 0% and I/O wait more than 75 % .
> It terminated oracle instance once, we have supported version of
> Volume manager and Veritas File system.
> Due to some other constraints we are not able to upgarde it to 2.8
> and have oracle 9i for now. Can someone help me in tuning systems file
> as much as possible so that we can utilize 2.6 to its best capacity.
> Thanks
>

Why do people have this concern when they have iowait?

Let me say it again.

IOwait is *only* measured in idle. So, True idle is the sum of iowait
and stated idle.

If there is something ready to run, and we have iowait on the system, it
*will* run.

The real question that you have to ask here is, is there a measurable
deviation from the expected behaviour with regards to business metrics
(eg response time and throughput). If not, then what exactly are you
trying to fix?

alan.
--
Alan Hargreaves - http://blogs.sun.com/tpenta
Kernel/VOSJEC/Performance Engineer
Product Technical Support (APAC)
Sun Microsystems