A size-based recommendation makes a lot of sense, but the lowest value
below--350,400--gets stern disapproval from Health Checker. Accordingly, I
think we'll try this modified table:
TOTAL REAL THRESHOLD
---------- ----------
< 2Gig minimum of MCCAFCTH=(400,600) <--- Health
Checker minimum acceptable
2-6Gig minimum of MCCAFCTH=(2000,2500)
> 6Gig minimum of MCCAFCTH=(5000,6000)
The LPAR we lost, by the way, sits right at 6 gig. As others have
suggested, we're also looking at buying some more memory for that box. It
truly has gotten cheap.
.
.
.
JO.Skip Robinson
Southern California Edison Company
SHARE MVS Program Co-Manager
626-302-7535 Office
323-715-0595 Mobile
[EMAIL PROTECTED]
IBM Mainframe Discussion List <[email protected]> wrote on 01/10/2006
02:31:39 PM:
> Skip Robinson wrote:
> > What's startling about this recommendation is
> >that it's ten times (!) the default value of MCCAFCTH=(400,600) . We're
> >concerned that such a high value will increase paging rates
> >considerably.
> >Maybe it's overkill.
> >
> >Any thoughts?
>
> Actually IBM started changing the default recommendations several years
> ago. As Mark indicated, the recommendations vary depending of the real
> storage size. From OW55729 (10/23/2002)
>
> TOTAL REAL THRESHOLD
> ---------- ----------
> < 2Gig minimum of MCCAFCTH=(350,400)
> 2-6Gig minimum of MCCAFCTH=(2000,2500)
> > 6Gig minimum of MCCAFCTH=(5000,6000)
>
> Now OA12185 suggests mccafcth=(4000,4500) but doesn't indicate the real
> storage size range. It appears you want to be careful with smaller
> LPARs, as OA12684 describes a performance hit on systems with only 512MB
> of real. Search IBMLink with a keyword of mccafcth for a quick idea of
> the problems and recommendations.
>
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