One of our CEC's with the ICF is going off lease and we're looking at
options for not enabling a ICF CP on the replacement CEC.
Mark Jacobs
On 10/14/13 16:25, Bernard, Michael J wrote:
Hello Mark,
Just curious as to what the drivers are behind changing your configuration from a
balanced one between two CFs vs. keeping everything in one and failing everything over to
2nd CF if/when necessary. Is it strictly performance related?? Curious because we have
been running in a "balanced" 2 CF environment for many years.
Thank you,
Mike Bernard | z/OS Engineer Team Lead | GTI ECS Enterprise Software
Engineering (ESE) or Extreme Software Engineering
J.P. Morgan Chase & Co. | 1111 Polaris Pkwy, Columbus, OH 43240, US | Office:
614-213-5768 | Cell/pager: 614-406-1045 | Fax: 614-213-4171
(michael.j.bern...@jpmchase.com)
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Mark Jacobs
Sent: Friday, October 11, 2013 3:09 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Coupling Facility Structure Duplexing
We're currently running two CF lpars, with about 1/2 of the structures in each
CF, and where appropriate we're already duplexing selected structures.
So, my question really is, is the CPU time needed to manage the duplexed
structure the same as, greater than, or less than the amount of time needed for
the primary structure? To make the question even harder, I'm not asking about
zOS CPU time, but ICF CPU time.
Mark Jacobs
On 10/11/13 14:56, Mark Zelden wrote:
On Fri, 11 Oct 2013 14:21:47 -0400, Mark Jacobs <mark.jac...@custserv.com>
wrote:
We're looking into moving to have all of our structures reside in a
single coupling facility lpar, but have a second one configured as a
hot standby, and as a target to move structures to when a planned
outage of the primary CF is necessary.
I know the answer is "It depends", but does anyone have an WAG on the
CPU usage for the second CF lpar if we use it for structure duplexing
only during normal operations.
(disclaimer... I have no real world experience / measurements to go from
- hopefully someone who is duplexing will answer or Mark Brooks).
If you duplexed 100% of the structures, my SWAG would be that the CPU
usage for the 2nd CF would be the same as the primary CF, but that CPU
usage would of course increase due to the overhead / coordination of
duplexing.
An installation guide to duplexing rebuild:
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/iea2f1c2/4.
3?SHELF=all13be9&DT=20120814144655
I assume you really wouldn't do "all" structures.
Deciding whether to duplex a structure:
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/iea2f1c2/4.
3.2?SHELF=all13be9&DT=20120814144655
Mark
--
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mailto:m...@mzelden.com ITIL v3 Foundation Certified Mark's MVS
Utilities: http://www.mzelden.com/mvsutil.html
Systems Programming expert at
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Mark Jacobs
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Londo Mollari - Babylon 5
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The quiet ones are the ones that change the universe...
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Londo Mollari - Babylon 5
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