On Fri, 15 Feb 2008 10:23:45 -0600, Kelman, Tom
<[EMAIL PROTECTED]> wrote:
>When WLM was set up in this shop about 5 years ago the DDF workload was
>extremely low. The person that set up WLM assigned DDF to "NEWWORK".
>Over the past year DDF processing has growing considerably to where it
>is now taking approximately 10% of the production LPAR during prime
>shift. Most of this work is our Online Banking and Online Teller
>applications making direct requests to DB2 on the z/OS system, so it is
>an important workload. We want to pull DDF out of NEWWORK and give it
>its own service class. Does anyone have any recommendations as to how
>to set up a service class for DDF, or can you point me to some good
>documentation on the subject? Thanks for any help you can give.
>
Someone (I think Tom Moulder) recently posted about WLM / DB2 and
included a link to a paper / recommendations. Cheryl Watson has also
published things, but I'm not sure if it is on her web site. Here starter
policy is though.
Here is what I do:
I have DDF work classified as production vs. test/development just like other
workloads (I have 3 levels). The first 2 ("high" and "med") both have 2
periods with the first period having a response time goal / duration and the
2nd period having a velocity goal at a lower importance. The 3rd srvclass
(default, catch all, used for batch processes) has 3 periods. The 2nd
period has a very long duration (200000) and the 3rd period is discretionary.
The highest one is importance 1 and is only used for WebSphere created
enclaves (no DB2 data sharing in this environment and WAS runs on a
separate LPAR).
I used (and still do use) RMF post processor and RMF III to monitor the
distribution between periods and to help come up with a good "cut off".
Don't use response time goals if THREADS=ACTIVE or RELEASE(DEALLOCATE).
HTH,
Mark
--
Mark Zelden
Sr. Software and Systems Architect - z/OS Team Lead
Zurich North America / Farmers Insurance Group - ZFUS G-ITO
mailto:[EMAIL PROTECTED]
z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/
Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html
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