Re: DASD performance curve graphs??

[mcrump@xxxxxxxxxxxxxx]

Same here on our production 620's.  That means you have the right number of
arms and/or a high percentage of 'inactive' data.  Chances are it's because
you configured a finely tuned machine :-)

There is absolutely nothing wrong with having a machine reporting these
kind of numbers.  For you it means that you (if your workload demands it)
could go from 10% to 40% disk arm utilization and see very little negative
impact on response times and batch jobs (in general terms of course).  You
might not see this in an ongoing situation but you could have bursty
demands on DASD.  Or if you implement parallel IO processing you might see
an increase in disk arm activity.

If you are having these numbers and your IOP's are below threshold life is
good.  Of course, if you have performance issues it will most likely point
to the CPU or memory and simply adding more faster disk units isn't going
to help.....

Mike


We're running at about 55% capacity, so we're fine there.  The
interesting thing about this thread to me is the activity issue.  Even
on our 640 production box, at the busiest time of the day, supporting
several hundred users, and OMS reporting 500,000+ database
transactions per hour being mirrored, I've never seen the disc drives
report more than 10% busy, and most of the time they're less than 5%.






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