On Wed, 11 Apr 2012 10:24:10 -0400, Mark Jacobs mark.jac...@custserv.com
wrote:
We had a discussion yesterday regarding our obsolete IEFUSI exit and how
it should be modernized to even know about the virtual storage region
above the 2GB line.
One of the concerns was that since IEFUSI has no practicable effect on
authorized programs I was asked to come up with some ways to better
manage our environment just in case some user decides to allocate and
start using massive amounts of above the bar storage.
My question to the mailing list is do you manage towards this scenario
and if so, how?
I'm not really worried about STCs and authorized users. Nothing I can do
about them except allocate 2000 page volumes (just kidding).
The comments in my IEFUSI exit from 2005 still hold true and explain
what I am doing. So far, it has worked out fine. My client does have
64-bit usage and also large pages running 64-bit WebSphere.
Basically, I just want to keep someone from playing with 64-bit
from destroying the system.
My SMFPRMxx MEMLIMIT is to 10G.
9/14/2005 M ZELDEN FORCE MEMLIMIT OF 5G FOR ANY JCL
SPECIFICATION OF ANYTHING OVER 5G BUT
ALLOW MEMLIMIT NOLIMIT (16383PB) IF
REGION=0M. IF NO JCL SPECIFICATION IS
USED (OTHER THAN REGION=0M), THEN TAKE
THE MEMLIMIT DFLT FROM SMF (SMFPRMXX).
THIS WILL ALLOW SYSTEMS THAT NEED A
HIGHER MEMLIMIT TO HAVE SMFPRMXX BE
THE CONTROLLING FACTOR - AS LONG AS
MEMLIMIT IS NOT SPECIFIED IN THE JCL.
SINCE ONLY STCS CAN USE REGION=0M, ONLY
STCS WITH REGION=0M CAN GET MORE THAN
THE FORCED MEMLIMIT OR THE SMF DFLT.
By having SMFPRMxx be the controlling factor, I could easily raise it
if a problem came up with no JCL changes etc. So far, I've haven't
needed to do that. Keep in mind I updated this exit for the brave
new world in 2005. I'm slightly surprised it's been 7 years and
I haven't needed to modify it except for a change in 2007 related to
OA14391 which affected z/OS 1.7 z/OS 1.8 and above. That
APAR kept STCs with REGION=0M from getting MEMLIMIT=NOLIMIT
so I updated the exit to force MEMLIMIT=NOLIMIT for STCs with
REGION=0M (which was the behavior prior to OA14391).
Regards,
Mark
--
Mark Zelden - Zelden Consulting Services - z/OS, OS/390 and MVS
mailto:m...@mzelden.com
Mark's MVS Utilities: http://www.mzelden.com/mvsutil.html
Systems Programming expert at http://expertanswercenter.techtarget.com/
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