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 <[email protected]> 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:[email protected]] On >> Behalf Of Lester, Bob >> Sent: Tuesday, March 20, 2012 6:51 AM >> To: [email protected] >> 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:[email protected]] On >> Behalf Of Vernooij, CP - SPLXM >> Sent: Tuesday, March 20, 2012 2:02 AM >> To: [email protected] >> Subject: Re: DASD Mod9/Mod54 >> >> "Lester, Bob" <[email protected]> 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. If you have received this e-mail by error, please notify the > sender >> immediately by return e-mail, and delete this message. >> >> Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its >> employees shall not be liable for the incorrect or incomplete transmission > of >> this e-mail or any attachments, nor responsible for any delay in receipt. >> Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch >> Airlines) is registered in Amstelveen, The Netherlands, with registered >> number 33014286 >> ******************************************************** >> >> >> ---------------------------------------------------------------------- >> For IBM-MAIN subscribe / signoff / archive access instructions, send email > to >> [email protected] with the message: INFO IBM-MAIN >> >> >> >> mailgate3.oppenheimerfunds.com made the following annotations >> --------------------------------------------------------------------- >> This e-mail transmission may contain information that is proprietary, >> privileged and/or confidential and is intended exclusively for the > person(s) to >> whom it is addressed. Any use, copying, retention or disclosure by any >> person other than the intended recipient or the intended recipient's >> designees is strictly prohibited. If you are not the intended recipient or > their >> designee, please notify the sender immediately by return e-mail and delete >> all copies. OppenheimerFunds may, at its sole discretion, monitor, review, >> retain and/or disclose the content of all email communications. >> --------------------------------------------------------------------- >> >> ---------------------------------------------------------------------- >> For IBM-MAIN subscribe / signoff / archive access instructions, send email > to >> [email protected] with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
