Thank you Mark for this very honest answer Those of us who tried, and those of us who got the bills from both world, know better than have a definite answer It is quite funny to see that people very often speak of a single engine IFL machine and compare it to a several core x86 installation I do not believe anyone here would run production on a single engine box or run Dev and Test on that single engine machine. This is the kind of consideration that has to be taken into account when calculating TCO's Another aspect is that you have to consider the price of DASD in a z or in a x86 environment. I never paid the same per TB in both cases and the price of PPRC or Truecopy was different depending what you were attached to!
So TCO calculation is a very difficult task. Bruno Sugliani zxnetconsult(at)free(dot)fr On Sun, 9 Sep 2012 23:57:18 -0600, Mark Post <[email protected]> wrote: > >Um, no, that's not what those number mean. A full speed zEC12 processor at >5.5 GHz, is only about 53% faster than a 3.6GHz Intel processor. It's >possible to consolidate a very large number of mostly idle systems onto a >single System z processor. There are other systems running workloads that >require 1 or 2 or even more System z processors for a single system image. >This is the point that most people just don't seem to want to understand. >What platform is best for a given workload really does depend on the >characteristics of that workload, and the business requirements that surround >it. There is no one platform that is best for all workloads. Period. Anyone >that tries to tell you one platform is the best for all possible workloads is >either lying or incompetent. Anyone that tries to tell you that the purchase >price of the box divided by the total number of instructions executed per >second is the only metric to consider is either lying or incompetent. Doing >real TCO comparisons between disparate architectures is hard and a lot of >work. Because it's hard, most people don't bother trying to do a very good >job at it and make overly simplistic models that provide the answers they want >to hear in the first place. > > >Mark Post ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
