BATCH_RCLMIGDS ARM information
Article ID: 29778
Updated On:
Products
Issue/Introduction
How to setup BATCH_RCLMIGDS ARM?
Environment
Release: Disk™ Backup and Restore
Resolution
The option can be set via SETALLOC or in the ALLOCxx Parmlib member using parameter BATCH_RCLMIGDS=SERIAL|PARALLEL
SERIAL indicates that the system will allow the CATALOG LOCATE function to recall data sets on its behalf, resulting in serial recall processing. PARALLEL indicates that the system will note which data sets are migrated and recall them in parallel, potentially reducing job execution time.
If VANTAGE - ARM is installed on the partition:
ARM can start one or more DMSAR servers, optionally dedicating them to either tape or disk restore work, and leave them active, waiting for more work. So if there are 5 or more DMSAR servers defined in ARM, then above sample is covered by ARM.
We feel that ARM is a superior solution rather than Parallel Batch Restore (PBR). The z/OS solution will restore the data sets for a step where ARM and Exit6 will restore the data sets for the job prior to the job being started. In both ARM/Exit6 and PBR we are limited by the media that the archive is stored on (single tape, multiple tapes, DASD archives) but ARM has the higher potential to parallel process the requests since it will likely be processing more data sets the entire job rather than a single step.
If you don't have VANTAGE - ARM installed on the partition:
The parameter should still be left to SERIAL (which should be the default) for Disk. PARALLEL would enable HSM to recall data sets in parallel for a Batch job.
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