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)

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