Configuring the DFSMStvs environment and defining resources

Before your applications can use DFSMStvs, you need to set up your environment and define resources for DFSMStvs. You can use these list to help plan the tasks that you need to complete.

Determine which applications need the ability to update recoverable data sets concurrently with CICS® usage of those data sets.
Determine which of them can use DFSMStvs support.
Determine the sizes and number of coupling-facility cache structures and their connectivity.
Determine the size of the coupling-facility lock structure.
With the use of DFSMStvs, batch jobs update recoverable data sets while CICS is also using them. This might result in an increase in locking activity.
Determine the requirements for the SMS configuration, including storage-class specifications, specification of coupling-facility cache structures, connectivity, and modifications to the ACS routines.
If you have already established storage classes for VSAM RLS and coupling-facility cache structures, it might be possible to use those for both VSAM RLS and DFSMStvs.

This information covers these topics:

In order to enable DFSMStvs on your z/OS system, you need to:

Contact IBM to obtain a license for DFSMStvs
Update SYS1.PARMLIB member IFAPRDxx with the following statements:
```
PRODUCT OWNER('IBM CORP')
NAME('z/OS')
ID(5650-ZOS)
VERSION(*) RELEASE(*) MOD(*)
FEATURENAME(DFSMSTVS)
STATE(ENABLED)
```
and issue the MVS command: SET PROD to enable this member
Configure the DFSMStvs environment including the SYS1.PARMLIB parameters as explained in this chapter
Restart SMSVSAM.

For information about enabling DFSMStvs on your z/OS® system, see "Installation Information" in the ZOSV1R4 PSP upgrade, subsets ZOSGEN and DFSMS. For migration considerations, see the migration chapter of z/OS DFSMStvs Administration Guide.