Ed, Now that I can see "why" you asked the question, FWIW, I concur with your recommendation. I suspect Bill is correct about downward compatibility, but what person in their right mind would connect ancient devices to a current system.
Bob Richards -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Edward Jaffe Sent: Monday, July 23, 2007 8:14 PM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: Rotational Positional Sensing (RPS) 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. -- Edward E Jaffe Phoenix Software International, Inc 5200 W Century Blvd, Suite 800 Los Angeles, CA 90045 310-338-0400 x318 [EMAIL PROTECTED] http://www.phoenixsoftware.com/ ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html LEGAL DISCLAIMER The information transmitted is intended solely for the individual or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you have received this email in error please contact the sender and delete the material from any computer. SunTrust and Seeing beyond money are federally registered service marks of SunTrust Banks, Inc. [ST:XCL] ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
