The CA EPIC for z/VSE Quick DASD Allocation System (QDAS) maps disk space usage in virtual storage to drastically decrease the number of I/O operations required to allocate an output disk extent, thus improving your system's performance. Because of the potential performance advantage, we recommend that you activate QDAS in all your VSE machines in which CA EPIC for z/VSE will be used.
Only disk volumes that are defined to CA EPIC for z/VSE pools can realize a performance improvement when defined to QDAS.
See Chapter 1 of the CA EPIC for z/VSE User Guide for more information about QDAS.
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