Smells like a gratuitous advertizement, Barton. -----Original Message----- From: Barton Robinson [mailto:[EMAIL PROTECTED] Sent: Wednesday, May 18, 2005 9:05 AM To: LINUX-390@VM.MARIST.EDU Subject: Warning - select correct lpar processor type !
This happens more often than you'd think, don't be embarrased. This is why Velocity Software provides zTUNE. >From recent mail - note that zTUNE identifies the problem and most of the solution: CUSTOMER: >>Since you left we have gotten 3 linux VM machines configured and >>running with Websphere and other products. The linux installers >>seem to feel that the "servers" are running slowly. At this >>point in time we don't have the agent code running on all the >>servers, so I'm not sure how easily we can determine what is >>going on. Can you help me find out what is going on, and give me >>some pointers on how to look for problems using the velocity >>software? Thanks. BDR: Look at the esatune report CUSTOMER: >>Here is a one hour report, and granted I don't know what I'm >>looking at, but the bit that caught my attention is where it >>discusses the VM LPAR. I thought that VM is running on an IFL >>and therefore should have 100% of that engine. How can I tell >> >>1Report: ESATUNE Tuning Recommendation Report >>010:00:00 on 04/29/05 *** Interval analysis *** >>0*****zTUNE Evaluation ************* >> XAC1 User total PROCESSOR WAIT excessive at 33 percent. >> Current reporting threshold set to 20. >> This is percent of inqueue time waiting for >> specific (PROCESSOR)resources to become available. >> LPR3 LPAR share is too low, causing USER CPU Wait >> VM LPAR allocated share: 0.94 percent of total >> VM LPAR used 389 percent of allocated share >> >Date: Wed, 18 May 2005 10:29:05 +0100 >Reply-To: Linux on 390 Port <LINUX-390@VM.MARIST.EDU> >Sender: Linux on 390 Port <LINUX-390@VM.MARIST.EDU> >From: Graeme Westerman NFU Mutual Insurance <[EMAIL PROTECTED]> > >I have a confession / experience that I think maybe worth >sharing with you if you run multiple lpars on a Z series box, ie >mixture of z/OS lpars and z/VM lpars / Linux lpars. > >We have a single Z box in which we run 3 z/OS lpars and 2 z/VM >lpars hosting SLES8 virtual machines. We were experiencing >performance problems on our prod z/OS lpar in which we were >running at 100% cpu at times and investigations led us to >conclude nothing unusual was happening in that particular lpar, >we were however stress testing on our VMDEV1 linux instances >which were very busy. > >To cut a long story short I went back to our HMC console to look >at the Activation profiles setup for all the lpars (these >profiles slice and dice the central storage(memory) and >processors each lpar uses). On our 2 VM lpars the mode selected >was "Linux only" (displays a Penguin on the lpar icon) and the >choice of processor is one of the following; > >dedicated central processors >dedicated integrated coupling facility processors > >not dedicated central processors >not dedicated integrated coupling facility processors > >Now this is where my logic let me down, as I have mentioned >before we run a single Z box and do not do any clustering >(sysplex) with coupling facilities etc, so the only choice for >me to make was to select the "not dedicated central processors". >What I should have selected (some months ago mind you!) was "not >dedicated integrated coupling facility processors" (an obvious >acronym for Integrated Facility for Linux (IFL) !). > >So the net result was both our "Central Processors" were being >used by all lpars which was why we were starting to see >performance problems where 1 busy lpar was starting to affect >the others. (Lpar weighting constraints excluded). > >Embrassed.... >Graeme > "If you can't measure it, I'm Just NOT interested!"(tm) /************************************************************/ Barton Robinson - CBW Internet: [EMAIL PROTECTED] Velocity Software, Inc Mailing Address: 196-D Castro Street P.O. Box 390640 Mountain View, CA 94041 Mountain View, CA 94039-0640 VM Performance Hotline: 650-964-8867 Fax: 650-964-9012 Web Page: WWW.VELOCITY-SOFTWARE.COM /************************************************************/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
