How about a system that is paging with 16G currently divided 12/4 and is z/VM 5.2. Would it be happier on say 14/2 split? It depends huh... Whenever I look it seems to be paging at 500 per sec to xstor and 100-500 to DASD.
Marcy Cortes This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose, or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation." -----Original Message----- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Marty Zimelis Sent: Tuesday, May 23, 2006 11:01 To: [email protected] Subject: Re: [IBMVM] z/VM 5.2 on z800 with 8G of memory I'd be inclined to go with Rich's suggestion. While it's true that your z/VM isn't paging much now, there will almost certainly come a time when it will. Rather than suffering erratic response time due to paging directly to DASD (even the Shark's cache is on the wrong end of the channel cable) at that point, why not leave some of your memory defined as Xstore as a preventative measure -- unless you think you need the full 8G of central storage now. Marty -----Original Message----- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Robert Payne Sent: Tuesday, May 23, 2006 1:53 PM To: [email protected] Subject: Re: z/VM 5.2 on z800 with 8G of memory Yes, but since our page rate is <1 I'm wondering if what we may gain with 8G main would be more than lost during those rare occasions that it does really have to page to DASD which in this case is a shark (ESS 2105). Maybe splitting hairs. Thanks Rich. -----Original Message----- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] Behalf Of Rich Smrcina Sent: Tuesday, May 23, 2006 12:48 PM To: [email protected] Subject: Re: z/VM 5.2 on z800 with 8G of memory z/VM still uses expanded storage for multi-tiered paging. It is suggested to allocate expanded storage for a smoother VM paging experience (in the event VM actually has to do any paging). On Tuesday 23 May 2006 12:44 pm, Robert Payne wrote: > Since we implemented z/VM 5.2 about a month ago, I changed the memory > configuration to 6G main and 2G xstore. With our typical workload, > the page rate is < 1 per second. We run 2 VSE guests normally, but the > last few weeks I've also had a 3rd (z/VSE 3.1.1 in development) one > going and it's mostly idle. This holiday weekend I may be making some > I/O configuration changes for the 3590 tapes that just rolled in and > was considering (while I'm at it anyway) changing the real memory > configuration to use all 8G for main storage for VM. All VSE use NOPDS. > Performance has not been a problem, just thought about which might be > better. Yes I know, my mileage may vary. :) > > Any opinions about memory here ? > > Thanks, > Bubba -- Rich Smrcina VM Assist, Inc. Main: (262)392-2026 Cell: (414)491-6001 Ans Service: (360)715-2467 rich.smrcina at vmassist.com Catch the WAVV! http://www.wavv.org WAVV 2007 - Green Bay, WI - May 18-22, 2007
