The PDS Compress function uses a work file to perform the compression. It is allocated by the //COMPWORK dd statement in the distributed COMPRES procedure, and must be big enough to hold the largest PDS selected for compression. The supplied primary and secondary space allocation quantities are adequate for processing most PDSs, even when limiting the work file to a single volume. However, to compress a very large PDS, the space available for the work file on one volume cannot be sufficient. If you view this as a potential problem, update the COMPRES proc directly and change the value of the WRKVOLS= parameter, which defaults to 1. A larger value permits the work file to extend to multiple volumes as needed. Set it to the maximum number of volumes you want to make available to the work file. Your installation's configuration limits the value you can assign to this parameter.
The distributed procedures for ARCHIVE, DMS, RECOVER, RESTORE, and RETAIN all include dd statements for tape drives that have been commented out. Although these dd statements can be uncommented to cause system allocation routines to allocate the proper device when the job is initiated, CA Disk default processing dynamically allocates them when and as needed. Dynamic allocation is recommended because the actual need for the device depends upon the CA Disk parameters that are specified for the job. Simulated functions probably do not need the drives, but when submitted in live mode, they do. Similarly, the CA Disk ARCHIVE and RESTORE facilities have options to queue the requests rather than executing them immediately. Queuing the requests does not require the drives, but later processing of the queues does.
TAPE is used for the tape unit name and is not included as a symbolic parameter. You can update it to the appropriate value for your installation.
The region size in most of the procedures has been set at 5120 KB. Monitoring the actual memory use during the evaluation period can permit further reductions, based on the specific processing at your installation.
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