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Introduction Quick DASD Allocation System (QDAS)
2-52 BIM-EPIC Installation and System Guide
Quick DASD Allocation System (QDAS)
Introduction
The BIM-EPIC 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 BIM-
EPIC will be used.
Only disk volumes that are defined to BIM-EPIC pools can realize a performance
improvement when defined to QDAS.
See Chapter 1 of the BIM-EPIC User Reference for more information about QDAS.
If your disk volumes are available to multiple VSE machines, you must:
Create a QDAS Share File for each shared volume.
Activate QDAS in every machine that shares the volume.
Failure to meet either of the requirements above can result in disk dataset corruption.
Description
Sharing Disk
Volumes
WARNING!
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