Eric I've published a methodology for doing this kind of migration planning. The presentation can be found at HTTP://velocitysoftware.com/present/ConsTECH Probably for what you want, start at HTTP://velocitysoftware.com/present/ConsTECH/sld015.html One day I'll add some notes to make this a little less cryptic.
I know there are people that try and get their predictions to 3 significant figures in terms of what your end "z" requiremengs will be, but considering all the variables, it's just not possible. But you can use a simple estimator - if it is off by 5-10%, that I think is very acceptable. At the rate that Linux on "z" is improving, this methodology will prove to be conservative. For moving Linux workloads from Intel to "z", I use a number of 4 for Mhz to MIPS, thus if your application has a requirement for a one minute period of 1GHz, then you could assume it would have a 250 MIP requirement for a minute. If this must run on a single processor, your choice of "z" processors becomes limited, you would not do this on a G5 or G6. For a proof of concept that I worked on for Windows apps on Intel to Linux on "z", the number seemed closer to 6. If you would like to have some help getting the numbers for a SUN application, I would be delighted to help.... It would make for a very publishable case study. >From: Eric Sammons <[EMAIL PROTECTED]> > >What about memory intensive? And how do you gage the CPU >intensive applications? For example we are planning to migrate >some of our Solaris (SPARC) applications off of SPARC and into >the z/VM Linux world. If I am looking at candidates for this >migration I see systems (SPARC) with 10 - 30 percent >utilization. What happens when I decide these word loads are >good candidates with their low cpu usage on the SPARC platform >but then install them into the Z environment and find out that >they now have a cpu usage of 80 - 90 percent? Is this possible? >Is there a good way to judge what applications on a given >platform might be best suited for migration? Right now I am >recommending that any candidate first do a QA of their >application in the Z environment prior to do doing the full and >final migration. > >thanks! >Eric Sammons >(804)697-3925 >FRIT - Infrastructure Engineering > > "If you can't measure it, I'm Just NOT interested!"(tm) /************************************************************/ Barton Robinson - CBW Internet: [EMAIL PROTECTED] Velocity Software, Inc Mailing Address: 196-D Castro Street P.O. Box 390640 Mountain View, CA 94041 Mountain View, CA 94039-0640 VM Performance Hotline: 650-964-8867 Fax: 650-964-9012 Web Page: WWW.VELOCITY-SOFTWARE.COM /************************************************************/
