Acutally, if the jobs are running consecutively, at pretty much the same
time, PAV will not be that great a help. The PAV is designed for multiple
accesses on different extents. Since all the jobs will be acessing the same
extent range, only one UCB will probably be used.
Not true. If the DEFINE EXTENT in the CCW chain indicates WRITE
INTENT, then access to a given extent is serialized. But if all the
active I/Os indicate READ INTENT, then every exposure (base and alias)
can have an active I/O to the indicated extent.
--
Bruce Black
Senior Software Developer
Innovation Data Processing
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