CA Vtape can support up to eight concurrent subsystems for each Logical Partition. Subsystems are named SVT1, SVT2,…SVT8. Subsystems can be part of the same CA Vtape Complex. They can share the Global VCAT, BSDS, and network storage. Subsystems can also be independent with their own control data sets and network storage.
As delivered, the SVTSCE JCL procedure defaults to starting SVT1. To start a Subsystem with a different subsystem name, change the SVTS parameter in the SVTSCE JCL produced to SVT2 or SVT3, and so on. You do not have to have Subsystem SVT1 running before you can start Subsystem SVT2 or SVT3.
Running more than one Subsystem requires different LOCAL VCATs and Virtual Drives.
The SVTS= parameter on the EXEC statement of the SVTSSE JCL procedure in the HLQ.CCUUPROC library determines which Subsystem is started. The SVTS= parameter on the EXEC statement of the RECYCLE and SVTSUTIL jobs determines which Subsystem the job communicates with.
If the subsystems are part of the same CA Vtape Complex, you can achieve the same results running SVTSUTIL batch commands that point to SVT1 or any subsystem. If a Subsystem must be active for the utility to run, point to one of the active Subsystems.
Commands and messages are prefixed with the Subsystem Name by default. If you type SVTS for a command prefix, it defaults to SVT1. SVT1 executes and responds. To communicate with SVT2, use it as the command prefix. The CA Vtape Subsystem processing the command echoes the command using the appropriate prefix.
Command and message examples
SVTS D P SVT1X0100I Command Complete SVT8 D U SVT8X0100I Command Complete
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