Re: $HASP052 JES2 RESOURCE SHORTAGE OF BERT XX% UTILIZATION REACHED [EXTERNAL]

[Geza Szentmiklosy]

As of z/OS 2.3 if your JES2 is at a z22 level there is new function called 
'JES2 resiliency - privilege support'. It is designed to reserve control blocks 
- including BERTs, so that it is possible for a user to access the system in 
situations where some JES2 resources are exhausted. The user can then recover 
the shortage by canceling or purging whatever is causing the shortages. Check 
the JES2 manuals or a simple Internet search will give you all the info.

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Re: $HASP052 JES2 RESOURCE SHORTAGE OF BERT XX% UTILIZATION REACHED [EXTERNAL]

[Feller, Paul]

Kenneth, I would agree that when the jobs hit JES2 the damage is done.  To 
handle things in the future you could look at increasing the size of your 
checkpoint datasets.  Maybe double or triple the current size so that if needed 
you can dynamically adjust things.  Naturally if you are using a coupling 
facility structure as one of your checkpoint that would also have to increase.  
To refresh my memory I took a quick look in the JES2 Initialization and Tuning 
Guide for z/OS 2.4 and the max size a checkpoint dataset can be is 17,000 
tracks.

>From the manual:
If you don't want to calculate the size, you can use a trial-and-error approach 
by over-allocating the space
(two or three times your current allocation) and let JES2 tell you with the 
$HASP296 or $HASP542
message if you need more. The largest checkpoint that JES2 will currently use 
is approximately 17,000
tracks on a 3390 device (Approximately 200,000 4K records). Allocating a new 
data set of this size will
ensure that it can accommodate increasing any section to the maximum size.



Paul Feller
GTS Mainframe Technical Support

-Original Message-
From: IBM Mainframe Discussion List  On Behalf Of 
Kenneth J. Kripke
Sent: Monday, May 9, 2022 8:00 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: $HASP052 JES2 RESOURCE SHORTAGE OF BERT XX% UTILIZATION REACHED 
[EXTERNAL]

Hello;

 We had an incident where about 8,000 jobs were submitted via a distributed 
process.  All the jobs were of the same name.  

It is my understanding that the BERT contains the CAT and JQE as well as the 
WSCQ as indicated in a bit indicator.  If the jobs were placed on hold via the 
$H GRP,JM=,  I am guessing 

The control blocks will still be built, hence, no benefit.  Is my assumption 
correct?  I would like to pose the question on how others have resolved the
problem.   

 

Sincerely; 

 

 Kenneth J. Kripke 

 

k.kri...@comcast.net <mailto:k.kri...@comcast.net>  


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