Hi Ron, There is a bug in vmstat that results in zero IO. I have seen the same when investigating a CCL problem. So don't (for now) rely on the IO counter in VMSTAT.
I did report it to IBM and I guess through that channel an update for vmstat will be created. Regards, Berry. -----Original Message----- From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Ron Foster Sent: woensdag 24 juli 2013 18:03 To: LINUX-390@VM.MARIST.EDU Subject: Performance on SLES11 SP2 guest after migration from SLES10 SP4 Hello listers, Over the weekend, we migrated a couple of large SAP systems from SLES10 SP4 to SLES11 SP2. These are large SAP application servers (22GB). Our SAP folks have a transaction that can be used to measure SAP response time. Our servers are grouped by the applications they run. Intermittantly one of the SAP application servers in one group will for a while have a response time that is about 3 times larger that the SLES10 systems. 1600 ms vs 500 ms. The other sles11 system in the other application group will have a response time that is around 700 ms, and the others in the group have around 350 ms. After a few minutes the response times on the SLES11 systems return to normal. I start to look at things. I issue the vmstat command and find something. The in column in the system area is all zeros. The man page says that this is the number of interrupts per second. Anyone else experience response time problems, or not get the interrupts information? Ron Foster Baldor Electric Company 5711 R S Boreham Jr Street Fort Smith, AR 72901 Phone:479-648-5865 Fax:479-646-5440 Email: ron.fos...@baldor.abb.com<mailto:ron.fos...@baldor.abb.com> IM Address:rfos...@baldor.com www.baldor.com<http://www.baldor.com/> ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ Dit bericht is vertrouwelijk en kan geheime informatie bevatten enkel bestemd voor de geadresseerde. Indien dit bericht niet voor u is bestemd, verzoeken wij u dit onmiddellijk aan ons te melden en het bericht te vernietigen. Aangezien de integriteit van het bericht niet veilig gesteld is middels verzending via internet, kan Atos Nederland B.V. niet aansprakelijk worden gehouden voor de inhoud daarvan. Hoewel wij ons inspannen een virusvrij netwerk te hanteren, geven wij geen enkele garantie dat dit bericht virusvrij is, noch aanvaarden wij enige aansprakelijkheid voor de mogelijke aanwezigheid van een virus in dit bericht. Op al onze rechtsverhoudingen, aanbiedingen en overeenkomsten waaronder Atos Nederland B.V. goederen en/of diensten levert zijn met uitsluiting van alle andere voorwaarden de Leveringsvoorwaarden van Atos Nederland B.V. van toepassing. Deze worden u op aanvraag direct kosteloos toegezonden. This e-mail and the documents attached are confidential and intended solely for the addressee; it may also be privileged. If you receive this e-mail in error, please notify the sender immediately and destroy it. As its integrity cannot be secured on the Internet, the Atos Nederland B.V. group liability cannot be triggered for the message content. Although the sender endeavours to maintain a computer virus-free network, the sender does not warrant that this transmission is virus-free and will not be liable for any damages resulting from any virus transmitted. On all offers and agreements under which Atos Nederland B.V. supplies goods and/or services of whatever nature, the Terms of Delivery from Atos Nederland B.V. exclusively apply. The Terms of Delivery shall be promptly submitted to you on your request. Atos Nederland B.V. / Utrecht KvK Utrecht 30132762 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
