Using a sector number of x'00' effectively disabled RPS on devices
that did care.
Edward Jaffe wrote:
Richards.Bob wrote:
Do you know of any DASD subsystem that does not publish RPM information?
I thought not. They still "care". <grin>
But kidding aside, I would suspect the last time it "really mattered" it
would be a real 3990-3390 SLED.
Am I missing something in your question here?
I assume RPS sector numbers are *ignored* for ESS and newer devices.
But, the IBM documentation does not confirm my assumption. Rather,
they still fully document the RPS factors that are returned, how to
calculate the sector value, etc.
I noticed the tuning Redbook said that RPS delays cannot occur on ESS.
But, says nothing about what, if anything, the sector number you (are
expected to?) provide might be used for.
Setting the sector number to x'FF' in the ECKD locate record parameter
list disables the use of RPS. I'd like to see us do that for all
modern DASD devices.
--
Chris Langford,
Cestrian Software:
Consulting services for: VM, VSE, MVS, z/VM, z/OS, OS/2, P/3x0 etc.
z/FM - A toolbox for VM & MVS at http://zfm.cestrian.com
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