How to Prepare and Recover CA Vtape › Off-Site Disaster Recovery › Return to the Production Data Center

Return to the Production Data Center

After you are ready to switch the processing back to the PDC, perform the following procedure at the DRC.

To return processing back to the PDC

1. Vary all the Virtual Devices offline and fully Externalize all the Virtual Volumes.
2. Run GRRJCL to requeue any potential Virtual Volumes that have not yet been Externalized and, if there are any, Externalize them.
3. Stop CA Vtape.
4. Back up the product libraries, including the parmlib, the Tape Management System catalog, the BSDS, and the ICF catalog containing the Externalization entries. Only the Externalization entries with the format of PREFIX.VVE.Vvolser.PRIMARY/DUPLEX are required.
5. Gather the Backstore primary tapes and, if they were created, also the duplex tapes.

Perform the following steps at the PDC:

1. Restore the product libraries and the BSDS.
2. Follow the DRC-related steps in the section Disaster Recovery Preparation.
3. Restore the Tape Management System Catalog.
4. Restore the DRC ICF Catalog and merge it with the PDC ICF Catalog.

   Note: After the ICF catalog has been merged with the DRC ICF catalog, the catalog entries for CA Vtape DASD cache and Virtual Device data sets should be uncataloged. The entries to delete are PREFIX.VVE.V*.MM.CACHE, PREFIX.VVE.D*.*, and PREFIX.VVE.LDS*.

5. Restore the product libraries and copy the VTFILTR member and VTPARMS (if appropriate) to the PDC parmlib.
6. Restore the BSDS and perform all the steps in the section Recovering the Global VCAT. Add the options SCRATCH and DROP_INELIGIBLE to the RECOVER=GLOBAL utility statement, for example, RECOVER=GLOBAL,SCRATCH,NOINIT,DROP_INELIGIBLE.

   This process will not recover all the LDSs previously defined at the DRC, that are not currently defined at the PDC. Any non-Externalized Virtual Volume found in the BSDS will be returned to SCRATCH status in the Global VCAT.

7. Start CA Vtape.
8. Issue the following console commands on each CA Vtape subsystem:
   • SVTn SET RECALL=DUPLEX
   • SVTn SET HSOPEN=ON
   • SVTn SET MAXDRIVES=nn (only required for the Externalization and Recall Servers)
9. Submit your jobs requiring Virtual Volumes but keep Externalization in HOLD status.
10. Uncatalog all the primary Backstore physical tapes lost during the disaster. After this process finishes, issue the following console commands on each CA Vtape subsystem:

    SVTn SET RECALL=PRIMARY

11. Issue the following console command once:

    SVTn SET BACKTORE=RELEASE,G=*,SG=*

    You must not generate new duplex copies until all the lost tapes are uncataloged and the Backstore is set back to Recall from the primary tapes. CA Vtape will automatically Recall from the duplex tape when the primary copy is not cataloged.

12. Schedule RECYCLE jobs to read the duplex-only copies and create new primary and duplex tapes. You can send the new duplex copies off site to restart the Disaster Recovery process.
13. Run LIST=BACKSTORE reports to monitor the Virtual Volumes now Externalized to primary and duplex tapes, and to schedule the duplex tapes to ship to the DRC.