When a data set is being read from disk, CA Disk processes the data blocks within it sequentially as dictated by the organization type. Thus only active and used data blocks are read. This results in PDS, ISAM and VSAM data sets being copied to the archive tape in compressed format. Any subsequent restore or volume recovery results not only in the consolidation of several extents into one (defragmentation), but also in the compression/reorganization of the data within the single extent (eliminating the additional need to compress and reorganize these same data sets).
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