RE: disk full guideline

Here is the text of a PMR that I just sent to IBM.  Any thoughts or
comments?

Problem Description:
What is the rationale behind the 80% disk full guideline? We consistently
run, without any apparent degradation, in the 90% range, as well as we have
at the 80% level. During certain periods, the percent full approaches 96%,
with no apparent degradation.

We have 170 d/t6607 and 30 d/t6713 raided, at a usable 848 gig. Your
guideline on 20% free equals 160 gig of dasd. Is this a reasonable
guideline? The performance graphs show a difference of 2-3% between average
and maximum.

The holder of the purse is questioning the necessity of buying additional
dasd because of an arbitrary guideline. Please provide me with some
reasonable method of determining what is appropriate.


Dick Lucas



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