CA Disk provides a native Auto Restore function that initiates a started task, DMSAR, each time a data set under its archive control is referenced. The DMSAR task restores the needed data set while the requester (an online user or a batch job) waits. When the restore is complete, the DMSAR task terminates.
The Auto Restore Manager (ARM) enhances this process with two levels of support. Both are optional, but highly recommended.
ARM can start one or more DMSAR servers, optionally dedicating them to either tape or disk restore work, and leave them active, that is, waiting for more work. These features increase auto restore performance.
ARM also provides a JES2 Exit that makes batch processing more efficient when the batch JCL references archived data sets. Instead of letting the job tie up an initiator while the needed data sets are restored one-by-one, the JES2 Exit support holds the job, and routes all the needed restores to ARM at once (where multiple servers restore the data sets more efficiently by grouping the restores so that all data sets on an archive volume are processed together, reducing the number of required tape mounts and the time required). ARM then releases the job when all restores are completed.
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