Installation and Configuration Best Practices › Configuration for Optimal Performance › Use the Auto Restore Manager

Use the Auto Restore Manager

Use the Auto Restore Manager (ARM) facility provided with CA GMI.

Business Value:

Using the ARM optimizes auto-restore functions groups together restore the requests for the same volume, which minimizes volume switches and improves response time.

Additional Considerations:

CA Disk provides a native Auto Restore function that initiates the DMSAR started task each time a data set under its archive control is referenced. The DMSAR task restores the requested data set while the requester (an online user or a batch job) waits. When the restore is complete, the DMSAR task terminates. The ARM enhances this process in two ways:

• ARM starts one or more DMSAR servers, optionally dedicating them to either tape or disk restore work, and leaves them active, that is, waiting for more work. These features increase the auto restore performance.
• ARM provides a JES2 Exit, which makes batch processing more efficient when the batch JCL references archived data sets. Instead of letting the job tie up an initiator while the requested data sets are restored one- by-one, the JES2 Exit support holds the job, and routes all the needed restores to ARM at one time. Multiple servers restore the data sets more efficiently. When all restores are completed, ARM releases the job.

Note: Use of the JES2 Exit is optional but strongly recommended.

More Information:

For more information, see the section Configure the Auto Restore Manager (ARM) - Enhance DMSAR in the chapter "Configuring CA Vantage SRM Interface for CA Disk" in the CA Vantage SRM Configuration Guide.