RE: IO wait

Jack,

You can run 'iostat -x 5 5' to see which disk are being used. In this example, the arguments state "5 sec increments, 5 times". This output may show a need to spread your data amongst your disk differently. -reggie

> -----Original Message-----
> From: Jack Silvey [mailto:jack_silvey_at_yahoo.com]
> Sent: Tuesday, July 23, 2002 11:59 AM
> To: Multiple recipients of list ORACLE-L
> Subject: IO wait
>
> All,
>
> We are tuning a new vital process on our data
> warehouse, and it is IO intensive - lots of parallel
> direct reads and writes. During our testing we are
> driving IO wait to ~60% (per top).
>
> questions:
>
> 1) is top a valid measure of IO wait?
> 2) Is a high io wait an issue to be concerned about?
> 3) how else can it be accurately measured?
> 4) How can I link IO wait to what is happening inside
> the database?
>
> Thanks,
>
> Jack
>
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