How to Prepare and Recover CA Vtape › Virtual Volume Recovery › Recover from Static Cache LDS Failure

Recover from Static Cache LDS Failure

If a DASD volume containing a portion of the CA Vtape DASD buffer pool is lost, the LIST=CACHE Report shows the specific Virtual Volumes that have been impacted.

Note: For more information about this report, see the chapter “Reports”.

Options are as follows:

• If the Virtual Volumes were Externalized, a valid copy can be Recalled from a Backstore tape.
• If the Virtual Volumes were not Externalized and the DASD volume cannot be recovered intact, the affected Virtual Volumes cannot be recovered and should be returned to scratch status in the Tape Management System.

Damaged or unavailable Static Cache LDSs will get allocation errors during CA Vtape mount or Externalization processing and will be flagged as ineligible. These LDSs will no longer be allocated or referenced.

If the LDSs cannot be recovered, copy, customize and execute an LDSDEFxx member from the PREFIX.SVTJCL library to recreate them. After the ineligible LDSs are reallocated or recovered, customize and execute the JCL in HLQ.CCUUJCL(RECLAIM) to reactivate them.

For a severely damaged Static Cache DASD buffer, rebuild the Global VCAT from the BSDS following the steps in the topic Recovering the Global VCAT. To facilitate the handling of non-Externalized Virtual Volumes residing in damaged LDSs, add the optional parameter SCRATCH to the RECOVER=GLOBAL command, for example, RECOVER=GLOBAL,NOINIT,SCRATCH.

Note: For additional information about the RECOVER=GLOBAL command, see the chapter “SVTSUTIL Batch Commands”.

During the recover process, all the Static Cache LDSs referenced by a Virtual Volume Entry are checked. Any LDSs that cannot be located and opened are automatically flagged as ineligible. Also, all Virtual Volumes in the damaged LDSs that have not been Externalized will be returned to Scratch status in the Global VCAT. A report is produced which lists the ineligible LDSs and their corresponding, if any, scratched Virtual Volumes. These Virtual Volumes will need to be scratched in the Tape Management System.