We are running Z/os 1.7. It recently came to my attention that VIO had been implemented in such a way that temp datasets no matter how small ALWAYS went to DASD. One of my predessesors used a storclas with Guaranteed Space. Anyway a user asked to be able to use VIO so I turned it on. Today he comes back with test results showing higher chargeback for CPU when using VIO. My question is - How is this possible? We are processing the same numbers of records and eliminating some physical I/O and the CPU usage is higher. The total CPU for the job doubled. I would have thought that eliminating some of the channel activity would have reduced CPU usage. Can someone explain this to me? Regards, Dave O'Brien
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