RE: disk arms (was RE: Tips for user ASP)

[Scott Mildenberger <Smildenber@xxxxxxxxxxxx>]

Charly,

I use WRKDSKSTS and look at the % busy over a period of time, the guideline
is that this number be below 40%.  When we run certain jobs that move a lot
of data around this number will be over 40% on almost all drives when
sampled for a period of time.  I'm not sure how to dig out the other
information you have but I do know we have 12 of the 17GB drives in a single
ASP that is 50% full.  It took us awhile to figure out why the performance
would go bad at times but finally figured out what was happening.  I will
say that in general our performance is really good but we have certain jobs
that move a lot of data and they cause problems, we have even started trying
to run certain jobs at night to minimize the impact.

Scott Mildenberger

> -----Original Message-----
> From: Charly Jones [mailto:charly301@hotmail.com]
> Sent: Saturday, June 29, 2002 9:50 PM
> To: midrange-l@midrange.com
> Subject: RE: disk arms (was RE: Tips for user ASP)
>
>
> How do you know that your disk arms are the problem?  What
> tools do you use?  Which reports (or screens) do you look at?
> Would you be willing to talk about how many disk arms are
> attached to what disk controllers and whether you have
> separate disk pools.  I would like to continue this
> discussion if anyone is interested.