Bill,
Sorry for the late reply. If all you are
looking for is VM number, consider the performance tools from Velocity
Software. I am using them to keep track of VM and some of VSE. ESAMON will
not drill down to ant operating system other than VM (zVM). If I can use it,
anyone can!
Cheers,
Loren Charnley, Jr.
IT Systems Engineer
Family Dollar Stores, Inc.
[EMAIL PROTECTED]
(704) 847-6961 x 2000
From: William Boyer
[mailto:[EMAIL PROTECTED]
Sent: Thursday, October 13, 2005
9:01 AM
To: [email protected]
Subject: Performance of zOS guest.
We were offered by an IBM Business
Partner to have a performance study conducted, but when they found we run the
zOS under zVM they informed us that IBM stated the tools would not work. Here
is a copy of what was sent to the business partner by IBM:
No, zOSPROD1 will not know about either
zOSTEST or zOSPROD2. Not only that, but RMF will not really know how much CPU
it (itself) is using, nor will it have any idea what the real configuration of
the machine is. I'm looking for the (now ancient) article explaining why you
shouldn't trust MVS performance data when it's running as a guest, but so far I
haven't found it.
BTW, the V=R and I/O Assist performance enhancements for high performance
guests are not available in an LPAR environment, so the instruction path length
is about double that of native z/OS performance. This has always been true of
guests under z/VM in an LPAR, and since all processors starting with z/890
& z/990 will be LPAR only, z/VM is dropping support for V=R and I/O assist
even in a non-LPAR environment, starting with z/VM 5.1. They must know this
already, I'm sure.
This seems to indicate that if we
would move our zOS to it’s own LPAR that we could get better performance
out of the zOS system.
QUESTION: How much
better would the zOS perform in it’s own LPAR? Currently we seem to be CPU constrained.
Can we still share the zOS DASD back
to zVM in READ mode on zVM?
Note: The reason we run zOS under zVM
is because in the old days we only had parallel channels and we would have
needed a CTC box to connect the two LPARS. But now with a z800 and escon all I
need is a cable. (Correct?)
Thanks in advance.
William L. Boyer
Senior IT Consultant /
Senior Systems Programmer
Business and Technology
Services
One West Pennsylvania Ave. ● Suite
700 ● Baltimore, MD
21204
Office: 410.832.8300 ext. 8419 ● Fax:
410.832.8329
www.emdeon.com/vips
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