CA Disk provides a convenient means to manage the index entries for archived data sets and the volumes that contain them.
The archival and backup functions assist you in managing your online storage, but the copies in the archives (and the index entries for them) must also be managed.
CA Disk combines the data sets being archived (or backed up) into a single output data set. This output data set is in sequential format, and therefore can be placed on a standard tape, a tape cartridge, or any disk device. Since archive and backup functions have traditionally directed their output to tape, the output data set has also corresponded one for one to an output volume. This has led us to think of them as archive volumes, with CA Disk keeping track of them in an archvols index. But keep in mind that each is really just a sequential data set that can be on either disk or tape.
Whenever a data set needs to be restored, rapid access into the ARCHVOLS data set is desired, regardless of whether it is on disk or tape. To provide this ability, CA Disk also maintains an index to each of the archived data sets. The index entry contains the exact location of each archived data set within the single ARCHVOLS data set.
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