Re: DASD performance curve graphs??

[mcrump@xxxxxxxxxxxxxx]

In the AS/400 Performance Capabilities Reference on page 237 (Chapter 14
'DASD Performance') it is stated 'At 40% - 50% utilization, the disk arms
are at the "knee of the curve".'  For their DASD performance charts they
assume 40% utilization for comparison purposes.

TBH - I never thought DASD "knee of the curve" was thought of in the 70%
range.  Interactive utilization - yes.


BTW - thanks for all the input on CCSID.  It was a great refresher and I
learned something new as always.....

Respectfully

Mike Crump




"Al Barsa, Jr." <barsa2@ibm.net> on 01/05/99 09:52:49 PM

Please respond to MIDRANGE-L@midrange.com

To:   MIDRANGE-L@midrange.com
cc:    (bcc: Mike Crump/IS/Ball-Foster)

Subject:  Re: DASD performance curve graphs??




At 02:05 PM 1/5/99 -0500, you wrote:
>
>
>Does anyone know where the performance curves for current DASD are
>documented?  The "knee" used to be at about 71% but that was back a while
>ago....
>
Don,

With all due respect, we consider the knee of the curve to be about 40%.

Al






+---
| This is the Midrange System Mailing List!
| To submit a new message, send your mail to MIDRANGE-L@midrange.com.
| To subscribe to this list send email to MIDRANGE-L-SUB@midrange.com.
| To unsubscribe from this list send email to MIDRANGE-L-UNSUB@midrange.com.
| Questions should be directed to the list owner/operator: david@midrange.com
+---