John - It's my understanding that this is how allocation currently works and I don't know of anything in z/OS 1.6 that changes it. I believe that the STK allocation code is supposed to do this for tape drives in an STK tape library and perhaps for non-library drives as well, but I don't think that we ever confirmed that.
Larre Shiller US Social Security Administration [EMAIL PROTECTED] V/M: (410) 965-2209 FAX: (410) 966-1936 www.ssa.gov "The contents of this message are mine personally and do not necessarily reflect any official position of the US Government or the US Social Security Administration." On Wed, 1 Jun 2005 09:19:45 -0500, McKown, John <[EMAIL PROTECTED]> wrote: >Q2: Tape Allocation. >We have four banks of 3490E tape drives. Each bank contains 8 drives. >Each bank is attached to two CHPs which are dedicated to that bank of >drives. I have been told that the "low address" tape drives appear to be >allocated in preference to the "high address" tape drives. I cannot >guarantee that the operators are not "messing around" using a VARY, but >I have been told that they are not. Also I haven't seen any VARY command >in the SYSLOG. So I assume that I am being told the truth. In the past, >there was a SELTAPE parameter which disappeared long ago. Does this >reuse of "low addressed" tape drives sound like what is supposed to be >happening? If so, how to do tell z/OS to "spread the I/O" around? I used >to have SELTAPE=NEXT. Again, due to other demands on my time, I have not >had a chance to double check that I'm being told the truth. But the guy >who is telling me this is a "reputable source" as the news-droids say. > > >Thanks. Oh - will z/OS 1.6 make any difference? We are supposed to go to >it something 3rd Q. > > >-- >John McKown >Senior Systems Programmer >UICI Insurance Center >Information Technology > >This message (including any attachments) contains confidential >information intended for a specific individual and purpose, and its' >content is protected by law. If you are not the intended recipient, you >should delete this message and are hereby notified that any disclosure, >copying, or distribution of this transmission, or taking any action >based on it, is strictly prohibited. ---------------------------------------------------------------------- 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
