Do you have expanded storage available for the z/VM LPARs? Even if z/VM
isn't paging, in the event that it does start, having it available will
help performance. The ROT is 20-25% of the LPAR allocation (which I
think is high, but that's what they say).
Mark Bodenstein wrote:
We recently upgraded from a 9672-R16 to a z9 BC G01 and in the process
went from having 2 GB storage to having 8 GB. HSA takes a bunch more
than it did, but we still have lots of extra storage to play with.
We run 4 LPARs - production z/OS and z/VM and test z/OS and z/VM. Right
now we're running with about the same LPAR storage allocations that we
had before, and see very little paging on any of our LPARs. The one
exception is when we run an image of our production z/OS system under
our test z/VM system for Disaster Recovery testing. Then we see lots of
paging.
We plan to allocate additional storage to the test z/VM system to better
accommodate the z/OS DR testing. But we're not sure if we would benefit
by allocating additional storage anywhere else, in particular to our
production z/OS and z/VM systems.
Since we're not paging on those systems, would we get any benefit from
allocating additional storage to them? Or would we just be spending
DASD space (because the backing store for paging would have to be bigger
to accommodate the additional storage) for no benefit?
Thanks,
Mark
--
Mark Bodenstein ([EMAIL PROTECTED]; 607-255-8059)
Mainframe Systems Programming, Systems and Operations
Cornell Information Technologies
Cornell University
Ithaca, N.Y. 14853
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Rich Smrcina
VM Assist, Inc.
Phone: 414-491-6001
Ans Service: 360-715-2467
rich.smrcina at vmassist.com
Catch the WAVV! http://www.wavv.org
WAVV 2007 - Green Bay, WI - May 18-22, 2007
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