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
