If you have RMF, you can run RMFPM (free download) on a workstation and
have it track both the LPAR MSU and the LPAR 4-hour rolling MSU in near
real time and periodically check the values in RMFPM, perhaps even take
a few extra seconds to have RMFPM display a graph of the values to make
trends more obvious.
If the object is just to get advance warning of capping, it isn't
necessary to continually monitor the values, since you are dealing with
a 4-hr average. If you hit your cap, you usually have had a load
problem (or application performance problem) for an extended period. Of
course the potential warning time this gives depends on whether the LPAR
is configured in a way that allows for a peak MSU that is higher than
the soft cap MSU by a significant factor: A peak LPAR MSU capability
greater than 4 x cap MSU means capping could occur from less than 1 hour
of peak load. More modest peak/cap MSU ratios restrict how quickly the
4-hour average can rise and also make it more likely that abnormally
high loads will hit that peak and generate some response complaints from
end users even before capping occurs, alerting that there is a load
problem that needs to be resolved before capping makes it much worse.
Using something like RMFPM to get a general idea of what constitutes
"normal" patterns of MSU usage for an LPAR for different hours of the
day and different days of the month can also teach you when you need to
monitor things more closely and also make it more likely that changes
that introduce application performance bugs will be spotted as an
abnormal pattern and fixed sooner rather than later.
JC Ewing
On 08/12/2011 09:05 PM, David Middlebrook wrote:
I have a z10 processor running multiple customer systems where we are using
VWLC, one of the systems was soft-capped during peak processing for the day
which caused multiple CICS regions to go max task resulting in time outs,
retries, transaction back out etc which just added to the demand on CPU
resources.
Is there a monitor that will raise an alert when a system is approaching being
soft capped?
TIA
...
--
Joel C. Ewing, Bentonville, AR [email protected]
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