Ron, I don't know 'NIX internals, but I would find a queue depth of 4, let alone 16 or 32 as totally unacceptable in z/OS land. That is what PAV is for, to reduce the queue depth.
Given enough PAV addresses, you should never see much if and queue depth. Chris Blaicher Personal opinion only. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Ron Hawkins Sent: Monday, August 18, 2008 10:43 AM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: Here we go again (was z/OS Hot Topics 19) John, Big Honkin' volumes in 'NIX land usually operate with Queue Depths of 8 or 16, and occasionally 32. I don't see any reason why HiperPAV would be any different. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > Behalf Of John Eells > Sent: Monday, August 18, 2008 8:12 AM > To: IBM-MAIN@BAMA.UA.EDU > Subject: Re: [IBM-MAIN] Here we go again (was z/OS Hot Topics 19) > > Hal Merritt wrote: > > Some performance improvements in that process are included. > > > > Also, a (extra cost?) 'hyper PAV' that uses a 'ucb' from a pool only > for > > the duration of the I/O. Talk about instant gratification :-) > <snip> > > HyperPAV (yes, it costs more for the DS8000 feature) generally requires > the use of fewer PAV aliases, which chew up fewer subchannels. For Big > Honkin' Volumes...er, that is, EAVs, I'd expect that having the systems > manage the PAV aliases dynamically would be a reasonably big plus, > because I'd expect most or all EAVs to have higher peak data rates than > their non-EAV counterparts on the average. > > -- > John Eells > z/OS Technical Marketing > IBM Poughkeepsie > [EMAIL PROTECTED] > > ---------------------------------------------------------------------- > 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 ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- 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
