Agreed, Service Units are a better measure for full-fledged chargeback and capacity planning. They work very well with managers who already understand SUs. If your management is less than the IBM trained management, they might not understand Service Units at the beginning.
The move from computer metrics to money metrics is an important one but it must not be sort of a hand wave. Managers need to understand WHAT they might have to pay for. When I first got told about Service Units alot of the systems programmers in the room did not get a clear handle on it and when I asked about Service Units for a VM customer, there were blank stares. We still did go with an accounting package for our MVS under VM that referenced Service Units, but I still had to use CPU seconds for the VM side of our workload. As an installation grows from chargeback introduction to full chargeback to capacity planning/modeling, Service Units are what are best. /Tom Kern On Wed, 4 Jun 2008 11:39:34 -0500, Hal Merritt <[EMAIL PROTECTED]> wrote: >That is a good approach, but IMHO CPU seconds are not a good metric for >comparing upgrade options and paths. Service units not only better >reflect the work being done, but also gives us a better idea how that >work could map to a different box. > >Remember, the OP doesn't really want to charge for anything, but to >somehow show the cost effectiveness of the solution. He can take the TCO >of the shop, and divide by the SU capacity to set a base. Then prorate >the costs using the SU consumption ratios of the applications. > >So, it costs us x to provide a maximum of a y level of service. Of that >service, App1 consumes A%, App2 consumes B%, and so on. Note that we >quickly move away from techospeak of CPU metrics to managementspeak of >dollars/pounds and percentages. Hopefully our management can relate the >applications to business units and then to each bottom line >contribution. > >HTH and good luck. > > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
