Datacom VSAM Transparency subsystems check

Products

• Datacom
• Datacom/DB
• Datacom/AD

Issue/Introduction

The Datacom VSAM Transparency (VSAMT) subsystem requires a z/OS subsystem (SSI) to work successfully in batch.
On a z/OS LPAR, multiple VSAMT subsystems can be concurrently active. 
Sometimes it is necessary to check which VSAMT subsystems are active.

Environment

Datacom VSAM Transparency batch on z/OS

Version 14.0 

Resolution

If the VSAMT subsystems are defined via CAIRIM, a CAISUBU utility can be executed: 
//CAISUBU EXEC PGM=CAISUBU                        
//STEPLIB DD DISP=SHR,DSN=your.Common.Services.CAW0LINK

It generates a report like the following one:
CAS9041I    Name   SSCT Address  Status   Init Routine 
CAS9042I    CA$K     address     ACTIVE                
CAS9042I    LAM      address     ACTIVE     LAMMVSI    
CAS9042I    PANV     address     ACTIVE                
CAS9042I    VT01     address     ACTIVE     DVVSI01    

The VSAMT subsystems can be easily identified in the above report as they have an Init Routine name composed by the string DVVSI followed by the subsystem prefix (as specified on CAIRIM statement); DVVSI01 in the above sample. 

Additional Information

A subsystem can also be defined without using CAIRIM; in this case the D SSI MVS command returns the name of the active subsystems. 

Finally, some z/OS monitors provide commands to list MVS subsystems. With SYSVIEW, one can issue the SUBSYS command and then search for the string DVVS (F DVVS).