Charles, Your summation is correct. But there are no more mainframes that run in REAL mode....they all run in LPAR mode. If you want to assume you are paying only for CPU time, then you can probably estimate that your new bill will be calculated as 1.48*T*c, where T is the z9 CPU Time, and c is the z900 cost per unit of work. However...as always...it depends.
Are you charged only per "MIP"? Is this a CPU intensive job? If you pay for I/O with ESCON on the z900 you will pay less if the job runs on a z9 with FICON. IBM tell clients that they can run identical workloads cheaper on new CECs because of the overall increase in efficiency of the the newer hardware. If that's true, going backwards in hardware would cost you more to run the same workload. But at the end of the day it will boil down to the charging algorithms. Are you moving from one CEC to another at the same service provider? If so, they probably have different algorithms on each CEC so the same job costs the same amount, even though it runs 8 times slower! The only way you are going to find out the real cost is to run the workload and see what happens. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
