Last use date support for VSAM is maintained by IBM module IDATMSTP in their ICF VSAM support. CA Disk provides a sample date stamp routine for you to use as member IDATMSTP in the installation library. The advantage of using the CA Disk version of IDATMSTP is that it provides exemption entries so that the CA Disk management tasks themselves do not cause VSAM data sets to appear used, similar to the support in the CA Disk SVC for non-VSAM data sets.**here
Note: The VSAM Date Stamp module updates the change bit (DS1IND02 bit in the Format-1 DSCB).
Modifications may be necessary to the source for the CA Disk VSAM data stamp module to initialize exclusion tables and to optionally change the diagnostic job name.
To provide the exemption lists support, CA Disk replaces the operating system's generic IDATMSTP module with its own copy that accommodates customized exemption lists by data set, job name, volume serial, or program. Note that the CA Disk SVC and IDATMSTP exemption lists are separate, and can contain different entries.
The CA Disk VSAM date stamp module contains a diagnostic facility, which displays the data, which CA Disk uses to decide if the last use date will be updated.
These diagnostic messages are generated automatically if the job name matches the job name identified in field DIAGNAME in ADSTMTST CSECT. The default name is DMSTEST. If you cannot use the job name DMSTEST, update the DIAGNAME field in CSECT ADSTMTST. The source code for ADSTMTST is in the CCUWSAMP library. Similar diagnostic facilities are provided for the IBM SVC module and auto-restore catalog management hook. If you change the job name for the VSAM date stamp module, consider changing the job names used for those functions.
CA Disk provides default exclusion lists, which bypass the VSAM date stamp update during CA Disk operations. To make additional entries, find the correct member in the CCUWSAMP library, and make your changes. The following is a list of CCUWSAMP members and the related exclusion list:
Exclusion List: Data Set Name
Exclusion List: Job Name
Exclusion List: Program
Exclusion List: Volume Serial
After you have made your modifications, you are ready to install date stamp support. Even if you have not made any changes, you should install the default date stamp module, to exempt CA Disk jobs from updating the reference date.
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