I am trying to understand how weights work with LPARs.
We have 1 z890 with 2 LPARS (prod and test)
We set the weights to 65/35 for Prod vs. Test
Our DBAs said to raise it to 75/25 so that PROD would get more steam. We
only have 3 engines
They said when we did that it got better.
Does changing the weights from 65/35 to 75/25 in favor of PROD actually make
that much difference? This is not a hard cap. We are using the HMC to set
this up.
I have a couple of performance papers I have been reading (z9 Performance
Tuning Redbook). However, I am not seeing how this is significant.
Our TEST LPAR has the basic DB2, testing, verification, Qual check out and
major TSO and application development workload.
Our PROD LPAR has just the production work for DB2.
We know our real memory is tight so we added a little more to it this
weekend. Our DB2 environment in PROD is Data Sharing. Therefore, there is
another physical CPU (z9) with 3 LPARs (PROD, TEST, and SYSPROG)
The two PROD boxes each have Data Sharing members on them for our 2
Production DB2s.
We share dasd between all 5 LPARs.
Hypothesis: If I reset the weights on my 2 LPAR box to 60/40 or 75/25 what
would I see. What reports would help me see if this is doing any good? I
have MXG and SAS. I can also run RMFPP. I have not really gotten into
performance tuning on this level so I need to try and find the reports that
will help me understand this picture better.
Thanks
Lizette
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