You've doubled the number of engines but approximately halved the per-engine speed in moving from a 2097-504 to a 2827-408. IBM LSPR indicates that the PCI is exactly the same for those two capacity models -- quite a coincidence, actually.
It's theoretically possible to do substantially better than the PCI average, but I strongly suspect a reporting problem. (I'd like to be wrong, though.) Theoretically you could see that result if you only ever have a maximum of 4 tasks that can be dispatched at any time -- half the engines in your new zEC12 would thus be idle, and capacity utilization could never exceed 50% on the new machine. (I'm oversimplifying but only slightly.) Do you have a lot of single threaded batch, for example, that would skew the utilization reports? Did you increase the memory to give DB2 more room to play? That can make a substantial difference. If you have a fair amount of Java code (as an example) that should do substantially better than the PCI average. -------------------------------------------------------------------------------------------------------- Timothy Sipples Consulting Enterprise IT Architect (Based in Singapore) E-Mail: [email protected] ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
