CA EPIC for z/VSE provides offload/onload and backup/restore functions for controlled sequential disk dataset versions identified in the CA EPIC for z/VSE catalog. Offload is only available on CA EPIC for z/VSE systems supporting both disk and tape management. Once copied to tape, offload deletes the disk VTOC entry and identifies that version as now residing on tape only whereas backup leaves the disk version in place. The dataset population to be processed by the offload or backup functions are identified by control statements created manually or by the offload system itself.
Onload restores datasets previously offloaded or backed-up to tape. Disk leveling is invoked when restoring multiple datasets as well as multiple extents for a single dataset. After restored to disk, an offloaded dataset version is identified as residing on disk only whereas a backed-up version is always identified as a newly created version 1.
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