Re: 5761SS1-42 HA Journal Performance

[Vern Hamberg <vhamberg@xxxxxxxxxxx>]

Rob

There is a kind of shoe-string version of option 42. I used to work for 
the guy who worked on lots of journaling when he was a developer at IBM. 
He said that just turning on commitment control itself will do some of 
what opt 42 does, even without opt 42. Rick Turner, performance guru at 
IBM once upon a time, has information on this.

You mention vendor software - that would limit you. But consider this 
quote from ftp://service.boulder.ibm.com/as400/web/benchmark/batprf.pdf 
- one of Rick Turner's articles.

"In the CL program that calls the batch program, specify the files that 
use commitment control and open them. Start a commit cycle in the CL 
program before calling the batch program. In the application program(s), 
change the file description to specify that commitment control is in 
use. Once the program returns to the CL program, end the commit cycle to 
force any pending file I/O to complete."

*http://tinyurl.com/yje42rg* is a link to more of Rick's 
recommendations. Good stuff that you might already know about.

But just turning ON commitment control around processes in which files 
are being journaled can give you almost the same benefit.

HTH
Vern

rob@xxxxxxxxx wrote:
> We're not using hardly any commitment control.  Vendor canned software.
>
> We're thinking of playing games with the 70 day license.  You know, put it 
> on right before month end and see if it smokes.  And if it makes two month 
> ends fly - buy it.
>
> How do you tell if there are any specific ptfs for an "option" of SS1? I'd 
> like to install this and not have to IPL. 
>
>
> Rob Berendt
>