-----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Gerhard Adam Sent: Tuesday, February 19, 2008 12:50 PM To: [email protected] Subject: Re: Price of CPU seconds <SNIP> One of the other examples uses $0.22/second which results in nearly $7,000,000 per year in costs. So, its not too difficult to extrapolate that a 20-engine configuration would recover about $140,000,000 in costs, and so on up to 54-engines for the z9 processor.
These numbers and their calculations are ridiculous. The notion of a single number metric for chargeback is every bit as ludicrous as suggesting there is a single-number performance value. <SNIP> That example stated that $800 per CPU/hr was the cost for a machine (undefined as to number of CPUs, MSUs, etc.). It also did not state what the system software cost, etc. It was a number used to give an example. And it was about what the cost was for an Amdahl 5990-1400 w/ 2 Gig C-Store and 2 Gig E-Store (and I can't tell you what circus bureau had that cost per CPU hour, but I used to work in the facility). So, the more processors you have to split the costs across, the lower the CPU/hr charge may be. And those charges are based on the SMF collected times (since that is what fed the accounting system). And then there could be charges for I/Os, tape mounts, ATL mounts, etc. (all things done by Circus Bureaus). So it is not so ridiculous. And as has been said and or alluded to by others, these costs have to be determined by what is considered to be part of the system costs. You have to take the cost of the CEC either as a lease for yearly costs or as a purchase and then divide that by the number of years of projected life). Same with all the software initial costs, maintenance/yr costs, personnel costs, etc. And then you have to define the number of hours that constitutes a year for that charge-back. It can be *VERY* complicated or get that way as more things are attempted to be captured by the accountants. Regards, Steve Thompson -- All opinions expressed by me are my own and may not necessarily reflect those of my employer. -- ---------------------------------------------------------------------- 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
