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Data sets compressed with the transparency are completely compatible with data sets previously compressed using the SUBSYS parameter - byte for byte the compressed format is identical. Data sets already compressed with the SUBSYS parameter can be defined as already compressed and can be read and written immediately with no change.
Control File records and cross memory services to support the PST are similar to but completely distinct from those which support the VSAM Transparency. Older releases of CA Compress running on different systems can even share the same Control File compatibly, except that the earlier release cannot recognize the PST data sets as compressed. Data sets defined to the PST can be uncompressed by the previous release using the SUBSYS parameter, which provides backward compatibility.
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