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 <[email protected]>
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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Mark Jacobs
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The loud ones only take the credit.
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