Thanks for the reply Bill. Unfortunately, any numbers I have now are not any indication of where we will be. We have been in the early stages of development of our first application of Linux on z/VM for the last two years and I have yet to get the project folks to give me much in the way of what workload to expect. I anticipated combining some of the 3390-3 dedicated to specific filesystems to a M9 just to make the servers more manageable. Other than that we were looking at the possibility of needing PAV on M27 volumes that will have DB2 database. The numbers we were given when fully implemented was that the DB would be accessable to 30k+ users.
Bill Bitner <[EMAIL PROTECTED]> Sent by: The IBM z/VM Operating System <IBMVM@LISTSERV.UARK.EDU> 07/03/2008 04:51 PM Please respond to The IBM z/VM Operating System <IBMVM@LISTSERV.UARK.EDU> To IBMVM@LISTSERV.UARK.EDU cc Subject Re: z/VM 5.3 and PAV Are you concerned you'll need PAV as you consolidate current volumes? or as you grow current workloads? If the former, I'd suggest looking at some statistics like I/O rate per GB of disk storage. For example if you are doing 15 I/Os a second on a 2.7GB disk, that's 5.6 I/Os/GB. If you are then going to configure your new volumes as 24GB volumes then on average you'd have 134.4 I/Os per second for the volumes. Ask your vendor about whether that would be significant enough to warrant PAV. It's been my experience that most VM shops do not need PAV for large number of volumes in the same way as they do in z/OS shops. If you do need PAV, a couple sources of additional information include: http://www.vm.ibm.com/storman/pav/index.html http://www.vm.ibm.com/devpages/farman/WAVVPAV.PDF http://www.vm.ibm.com/perf/reports/zvm/html/530hpav.html http://www.vm.ibm.com/perf/reports/zvm/html/520pav.html Bill Bitner
