Mike, Wouldn't you expect this to show up as ENQ contention rather than an increase in DASD service time?
Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On > Behalf Of Mike Schwab > Sent: Tuesday, March 20, 2012 6:52 PM > To: IBM-MAIN@bama.ua.edu > Subject: Re: [IBM-MAIN] DASD Mod9/Mod54 > > With more data on each volume, your accesses to the single VTOC may delay > accessing the datasets. When you had that data on Mod 9s, there were 7 > VTOCs to access that much data. > > On Tue, Mar 20, 2012 at 8:46 PM, Ron Hawkins <ronjhawk...@sbcglobal.net> > wrote: > > Bob, > > > > Then I can tell you that apart from the flattening of IO that I > > described, there is nothing in the design and architecture of the > > USP-V that would make a 3390-54 have less performance than 16 or so > > 3390-3 allocated on the same parity group. > > > > I'm afraid that it is the nature of your IO and not the size of the volume. > > > > What are you seeing in the ESS stats for the Parity groups? > > > > Ron > > > >> -----Original Message----- > >> From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] > On > >> Behalf Of Lester, Bob > >> Sent: Tuesday, March 20, 2012 6:51 AM > >> To: IBM-MAIN@bama.ua.edu > >> Subject: Re: [IBM-MAIN] DASD Mod9/Mod54 > >> > >> Hi Kees, > >> > >> Hitachi USPV. Very little IOSQ time, so no PAV. Looks like > >> mostly disconnect time. > >> > >> Thanks! > >> BobL > >> > >> -----Original Message----- > >> From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] > On > >> Behalf Of Vernooij, CP - SPLXM > >> Sent: Tuesday, March 20, 2012 2:02 AM > >> To: IBM-MAIN@bama.ua.edu > >> Subject: Re: DASD Mod9/Mod54 > >> > >> "Lester, Bob" <bles...@oppenheimerfunds.com> wrote in message > >> news:<8F672BE771329649A9EB59C7D9D6A2D9521E8B40@den- > >> xmail01.den.OFI.com>. > >> .. > >> > Hi Folks, > >> > > >> > With todays' modern disk arrays, is there any reason (z/OS > >> > based > >> or other) that response time for my Mod54s is consistently higher > >> than for my Mod9s? > >> > > >> > Assume identical workload against each, single array with > >> multiple LCUs. RMF says the LCUs are pretty well balanced. Single image. > >> Pretty simple setup. > >> > > >> > Thoughts? > >> > > >> > Thanks! > >> > BobL > >> > > >> > >> Which storage device? > >> Do you use PAV / Hyperpav? > >> > >> Kees. > >> ******************************************************** > >> For information, services and offers, please visit our web site: > >> http://www.klm.com. This e-mail and any attachment may contain > >> confidential and privileged material intended for the addressee only. > >> If > > you > >> are not the addressee, you are notified that no part of the e-mail or > >> any attachment may be disclosed, copied or distributed, and that any > >> other action related to this e-mail or attachment is strictly > >> prohibited, and > > may be > >> unlawful. 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