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Rob,

I have no direct experience...but I'll throw out the following:

This option used to be the Journal Caching PPRQ.

If you're journalling without using commitment control it can make a
huge difference.

But if you're using commitment control, it may not help if you're
batching up the changes. In other words, you change 1000 records and
then commit vs. committing after every record.

The REDBOOK Striving for Optimal Journal Performance on DB2 Universal
Database for iSeries gives benchmarks.
http://www.redbooks.ibm.com/abstracts/sg246286.html

HTH,
Charles

On Fri, Mar 12, 2010 at 12:04 PM, <rob@xxxxxxxxx> wrote:
Anyone out there using 5761-SS1, option 42 HA Journal Performance?
Did it really make a difference?
While we got some performance in our month end after purchasing SSD's we
didn't get near the performance benefit that we got in Rochester.  While
in Rochester we didn't journal the files because the data was in an IASP
and we were under time constraints to deal with the hassles of moving the
journals into the data library out of #MXJRN and making sure Mimix was
cool with this.  So we just didn't journal the data.

IBM ran some tracing on our last month end here and now they are
recommending we purchase the option 42.


Rob Berendt
--
Group Dekko Services, LLC
Dept 01.073
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com

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