Hi Terry - well paging delays could be a different set
of issues, though adding more memory may well be the
right response. Depending on the specifics, other possible
responses might also include increasing your paging
bandwidth or adding expanded storage, but memory does
seem the most obvious. It's impossible to say without
knowing the details - this is definitely the sort of case
where Bill Bitner's favorite saying ("It Depends")
applies. If you are experiencing current problems, you
can always call it in. Being more of a designer /
coder than a performance analyst / tuner, myself, I hate
to try to give general advice without knowing specifics,
and this isn't really the best place to have that detailed
discussion. All that said, if increasing your memory
within the supported range introduces any new problems,
certainly let us know through normal support channels.
- Bill Holder, z/VM Development, IBM Endicott
On Mon, 11 Oct 2010 19:22:55 -0400, Martin, Terry R. (CMS/CTR) (CTR)
<[email protected]> wrote:
>Thanks Bill. I will say that I am in fact seeing some of the same issue
s
that you mention as possible issues when running above the memory limit i
n
my current configuration at 130G.
>
>Most of this is due to our major over commit ratio hence paging delays f
or
us. So my hope was to reduce the over commit by adding more real memory,
but
I am starting to get concerned now doing this. I don't what else to do to
relieve this other than adding more memory. What is your thought, should
I
be worried ?
>
>Thank You,
>
>Terry Martin
>Lockheed Martin - Citic
>z/OS and z/VM Performance Tuning and Operating Systems Support
>Office - 443 348-2102
>Cell - 443 632-4191
>
