From r12.0 and later, the use of this DD card is obsolete: //VDSDIAGS DD DUMMY
This is because of several changes that were made for performance enhancements.
The following process provides much more extensive diagnostic info for Support.
When L1/L2 request diagnostics that will help determine Allocate problems, please do this:
Add these entries in Vkgparms and leave them:
PLSOPT98 (Y) * DIAGS ONLY TO JESYSMSG
PLSOPT99 (Y) * EXTENDED DIAGNOSTICS WILL BE CREATED
If either of these is a new entry, then issue command: F vam,PARMREF
To generate diagnostics, issue console command: F vam,DIAGS=jobname
Run your job and DIAGS will be written to the joblog.
Then issue command: F vam,DIAGS= and hit enter to null the diagnostics.
Then send in the entire job output to support.
On occasion that L2 suspects a problem with the VAM task itself, they will request that the
//VDSDIAGS DD DUMMY card be inserted in the VAM JCL. Then, the user would send in
the complete output of the VAM task.