Using ABSOLUTE has always given me the willies. As with all things, there no doubt is a time and a place for it. But we don't use it on our VSE guests. We used RELATIVE for years, we now use a freebie that's included with Z-VM V5 called VM Resource Manager. You may wish to check it out. You'll be amazed at what Resource Manager does with the share values.
-----Original Message----- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] Behalf Of Horlick, Michael Sent: Wednesday, April 23, 2008 12:39 PM To: [email protected] Subject: Using SET SHARE, performnace problem Cross-posted to both VMESA-L and VSE-L mailing lists Greetings, We have just converted the last of our 5 VSE machines to z/VSE 4.1.0 (from VSE/ESA 2.6.1) and are experiencing performance issues. My peak times are 98-100% utilization and people are complaining about poor response times. I don't know whether it's because I am using CICS data tables more now or because of the additional CPU utilization for z/VSE. Anyways, one question I have is the usage of the SET SHARE. I have been using the 'SHARE ABSOLUTE' directory control statement for each of my VSE machines (giving say 38% to one machine, giving 29% to another,etc...) with maximum share nolimit. The problems seem to occur when batch jobs are run in these predominately CICS/TS systems. I was wondering if maybe a SET SHARE RELATIVE technique would be more effective and what you do in prioritizing virtual machines within the physical machine? Thanks, Mike
