Although sequential migration to tape and the archival function can both free up disk space, the following differences should also be considered. Migration to tape handles only PS data sets while archive handles all types. Data sets migrated to tape are allocated and read by the application program directly, while archived data sets require that they be restored first, although this can be done automatically by the auto-restore feature. Migrated data sets are cataloged to tape and then managed by conventional means. (This can present a problem in deciding how long to keep the tapes and how to clean up the catalog when the tapes do expire. Migrating only GDG data sets helps manage this problem considerably.) CA Disk manages archived data sets using the index records. Index maintenance functions will recycle tapes, as well as keep the catalog clean by uncataloging appropriate data sets as they expire from the archives.
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