DYNALLOC


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   '-DYNALloc-'

DYNALLOC specifies dynamic allocation, instead of enqueue, to serialize the use of data sets. This allows cross-system serialization in a JES3/MVS environment.

Note:

The serialization is of value only when the dynamic allocation/JES3 interface is not disabled.
Run time increases when you use DYNALLOC to serialize data sets (as opposed to enqueue) because overhead is involved in dynamic allocation and serialization across multiple processors.
If a data set passes INCLUDE/EXCLUDE filtering and is migrated before BY filtering and DYNALLOC is used, the dynamic allocation causes the data set to be recalled. DFSMSdss waits for the recall processing to complete. If the data set is recalled to a different volume, a message is issued indicating that the VTOC entry was not found.
For an HFS data set, DFSMSdss ignores DYNALLOC and attempts to get a SYSZDSN enqueue. If DFSMSdss cannot enqueue the HFS data set, DFSMSdss attempts to quiesce the data set.