Hello listers, Before I begin, yes I know third level will cost us. Since SIE doesn't ge t down to the VSE we do not benefit from that and all CPU has to be emulate d.
We have moved an old VM/ESA 2.2 with VSE 2.3 to a new z890 machine. Obviously this level of VM can't run on zseries so we have put the VM int o an zVM 5.4 LPAR. It does run and since they came from an old (ESCON) mach ine the batch (mostly IO) runs very good. We did expect to see some performance penalties and we already sized the machine to twice the MIPS they used to have. And for the most part the gu est VM has a TV ratio between 1.9 and 2.5. Usually during batch the TV is jus t above 2 but during online hours we also see a TV above 3. There are a few transactions that have a very bad performance. (from 2 seconds to 2.5 minutes) The time also depends on the other load in the VSE (or perhaps e ven in the CICS). We have been playing with lots of settings. Such as, two virtual CPU's in the guest, two virtual CPU's in VSE with TurboDispatcher, one dedicated C PU to the guest VM. Any ideas on how to speed up the guests? Other than migrating the guest V M to the zVM 5.4 host? TIA, Berry.
