Hi Gerard, first, I think your remark to Mark's post is wrong. z/VM will certainly save you in the area of memory requirements. And then some in other areas, like admin, failover setup etc. To get specific: - we came from Intel some years ago and reduced a farm of 10 two-ways with a total of 38 GB of memory to a z900 with one CP (also used for VM/VSE workload) for z/OS and DB2, and two IFL's with 11 GB of memory. We were on 46C then. Due to our upgrade to ERP2004 / 640 we had to go to a z9-BC T01 subcapacity CP, again 2 IFL and about 22 GB of memory. Response times through all that remained more or less the same. - how is that broken down? 4 test systems 2 GB Vsize with 8 GB Vdisk swap 1 dev system ditto 1 historic (from before a merger) prod system, ditto 1 current prod system, 8 GB Vsize with 16 GB Vdisk swap 1 Solman system, 1 GB Vsize with 8 GB Vdisk swap in the same lpar there is also a 1.5 GB Vsize TSM server. When systems are really idle they don't use the allocated Vsize and z/VM takes a lot of real frames elsewhere. So in theory I could reduce the Vsize. But from experience I have found that this introduces lots of overhead when they are not idle. So I leave it to CP to schlepp resources around on an as-needed basis. - now for your question: It all depends on if your 3GB are used or not. If they are, you need them on zSeries as well, period. But if there is worst-case headroom in there you are almost guaranteed to use less. I don't think you will get a 640 down to 1 GB on a reasonably used instance. But you may very well run in about 1.5 to 2 GB, only using more as Vdisk swap in heavy usage. Feel free to ask if you more details. Best regards, Pieter Harder [EMAIL PROTECTED] tel +31-73-6837133 / +31-6-47272537
>>> "Ceruti, Gerard G" <[EMAIL PROTECTED]> 02/05/08 5:48 >>> HI Peter, Ron I am trying to get a feel if the memory requirements on say a pSeries of 3GB for a SAP APP server would be less on zSeries Linux under zVM, i.e. the physical would drop to 1 GB with 2GB as swop. Regards Gerard Ceruti may the 'z' be with you -----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Pieter Harder Sent: 05 February 2008 03:51 PM To: [email protected] Subject: Betr.: SAP Application Servers Hi Gerard, I have only one 700 system (our SolMan 400 system). Our standard is ERP2004 which is 640 based. Everything running under z/VM 530. We tried running bare metal in the porting phase, but dropped that for all the reasons mentioned on the list. That one 700 instance is running in a 1G VM, while all other 640 instances have at least 2G. But then our SolMan is only used where it can't be avoided.... Anyway, anything specific you want to know? Best regards, Pieter Harder [EMAIL PROTECTED] tel +31-73-6837133 / +31-6-47272537 >>> "Ceruti, Gerard G" <[EMAIL PROTECTED]> 02/05/08 8:45 >>> Hi All Anyone who is running SAP Application servers under zSeries Linux, bare metal or zVM that could share some information, SAP kernel 700,710 would be ok, in particular the memory requirements is of interest to us. Regards Gerard Ceruti may the 'z' be with you ________________________________________________________________________ __________________________________________________________ Standard Bank Disclaimer and Confidentiality Note This e-mail, its attachments and any rights attaching hereto are, unless the context clearly indicates otherwise, the property of Standard Bank Group Limited and/or its subsidiaries ("the Group"). It is confidential, private and intended for the addressee only. 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