Unicenter CA-Scheduler Job Management for VSE User Guide

7.5 Multiple CPU Considerations
7.5 Multiple CPU Considerations
Unicenter CA-Scheduler, as you have seen throughout this manual, has a great
deal of flexibility. When it comes to scheduling and controlling production on
more than one CPU, this flexibility continues to exist. In this topic, however,
we are going to discuss the manner in which most shops use Unicenter
CA-Scheduler in a multi-CPU environment.
First, you must get some basic IBM terminology out of the way. The term
SYSID will be used throughout this chapter.
SYSID is the system identifier that uniquely identifies each of the VSE
operating systems that execute in your environment. This is established by the
systems programmer when generating each of the VSE operating systems. At
times, the SYSID is referred to as the POWER SYSID.
You can allow POWER with shared spool to determine which CPU jobs run
on. You do this through control of the CLASS designations. That is, if a job is
to run in CLASS T, and there is a CLASS T on each CPU, then POWER will
determine which CPU on which to run the job. There will be times, however,
where you want a job to execute on a specific CPU (maybe it is the only place
where a program can get to a specific database). In this case, you can direct
POWER to execute the job on a specific CPU by specifying a RUN ON SYSID
value in the job base record.
If Unicenter CA-Scheduler is submitting your JCL from LIBTYPE=CMS, it may
not be necessary to generate POWER with shared spool. In this case, the
Unicenter CA-Scheduler CMS service machine will do what non-shared power
spool cannot—route the JCL to the correct POWER SYSID. This can be
accomplished by creating a file that contains the POWER SYSID and the VSE
guest machine name. The file has a filename of SCDSYSID and a filetype of
USERID and must reside on a CMS disk that is accessible to the Unicenter
CA-Scheduler CMS service machine. The Unicenter CA-Scheduler CMS
service machine will match the SYSID in this file with the RUN ON SYSID
value (SYSID=) in the job base record and submit the job to the corresponding
VSE guest machine. There must be at least one blank between the POWER
SYSID and the VSE guest machine name as follows:
1 VSEPROD1 2 VSEPROD2 3 VSEPROD3
Unicenter CA-Scheduler will generate the appropriate POWER JECL JOB
statement with the SYSID= parameter whenever a RUN ON SYSID is specified
on the job base record.
Chapter 7. Techniques 7-19