Jon: Well, this is interesting to me as well. At a client we are
running many Oracle servers, 130 or so. Performance data much to my
delight shows that most of the time they run in Q1 or Q2. Nice.
Production servers, too, seem to serve up their objects and go idle.
Now we introduce DB2 linux servers into the mix: and before anything
productive happens the DB/2 machines run in Q3! The IBM DB/2 lab down
the road from me here in Toronto is giving us some scripts to run, which
in combination with performance data will show us what is going on.
This is all single virtual processor running on a 3 way IFL. The linux
Oracle servers continue to happily run. Ask IBM - maybe you can get the
same scripts. Until you have some data to analyze it's tough to say if
additional vpus will help.
I'll post results likely within a few weeks.
David
Jon Brock wrote:
Actually, this leads me to a related question I have been wanting to ask: is anyone aware of an analysis of the difference between a single-IFL vs a multi-IFL system under VM?
We have an application we wanted to bring up under VM/Linux, but when we tried it we had great difficulty with it and eventually backed it off. It struck me as peculiar that the image we were using as a database server (running MySQL) took sometimes 80% of our single IFL. There shouldn't have been enough database activity to eat that much CPU. Our CIO chewed off the head of one of the local IBM guys (unfairly, IMHO) over the whole debacle. It seems to me that having a multiprocessor system could have made a difference for us, outside of the obvious doubling of CPU cycles. (The aforenamed now headless IBM guy had arranged for us to get a loan of another IFL, but the doctors here were inflicting too much pain on our CIO for him to be game for the delay it would have meant.)
Would having multiple IFLs have eased our pain in regard to processing a
client-server app? Seems like it would.
Thanks,
Jon
<snip>
Maybe running only with 1 IFL could be a issue, If you have a model 230,
then you can install 2 IFL´s and try to
test the scripts again.
</snip>
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