Common Address Space Shell (CASRV) › Create a Common Address Space through a z/OS START command

Create a Common Address Space through a z/OS START command

You can create a Common Address Space Shell (CASRV) by using a z/OS START command.

Using this method requires a JCL PROC. The z/OS system-level JCL PROC, IEESYSAS, can be used to start a CASRV. You can also use a component-specific JCL PROC, but it is not required.

The following scenarios let you pass internal commands through the START CIB:

• A CASRV that is created with a START command
• The full-function start address space that is created with an ASCRE CREATE

A CASRV retrieves any such internal commands from the START CIB during the initialization.

A CASRV created with a START command also examines the PARM= field on the EXEC statement image. Any parameters that are specified on the PARM= field are retrieved during the initialization and are processed as internal commands.

Example: z/OS-Supplied JCL Proc

Use the following z/OS START command to create the CASRV using the z/OS-supplied system address space JCL PROC:

S IEESYSAS,PROG=CASRVASI,JOBNAME=CASERV,SUB=MSTR,TIME=1440

Using this method of starting the CASRV requires that the CASRV component modules reside in a LINKLIST resident library. Furthermore, parameter specifications, if provided, must be defined in the z/OS logical PARMLIB data sets. The SUB=MSTR,TIME=1440 keywords can be eliminated from the START command if you want to run the CASRV under the primary job entry subsystem. However, the CASRV functions in both environments.