John -- Those are real concerns and this question came up during one of my zTech University sessions last week. My first thought is you may need to re-evaluate the number of LPs in the larger LPARs. Obviously if you have an LPAR with 3 logical processors, it can only have two logical processor on a machine with only 2 physicals. (You could have reserved LPs in case you decide to add physical engines in the future). That may lower your LP/CP ratio.
On the new machine you can use hiperdispatch (even on a one book machine) and that will "park" logical engines that are not needed by the workload at various points in time. This also may lower your LP/CP ratio as a parked LP does not have the same impact as an LP that is executing your workload with low utilization. I would make use of zPCR to study the options as this will provide some further insight into the overheads of various configuration. Barbara Nitz's post was right on. I agree with all of that. I don't recall reading about her configuration of the sandplex, and I think that is a very good idea. Al Sherkow, I/S Management Strategies, Ltd. Consulting Expertise on IBM Workload License Charges (WLC), LPARs and LCS Software Seminars on IBM Mainframe Software Pricing Voice: +1 414 332-3062 Web: www.sherkow.com ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
