If your system has a data compression product installed that compresses VSAM data sets it can be necessary to exempt CA Disk Restore and Recover processing from the data compression product's processing.
CA Disk reads VSAM data sets at the CI level when writing to the archive medium, for example, the data is read in a compressed format. However, during Restore processing, it writes to disk at the logical record level. This can cause certain data compression products to attempt to compress the data before writing it to disk. To prevent the data from being compressed twice, it is necessary to exclude CA Disk from processing by the data compression package.
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