DYNALLOC is an option for the data set DUMP, data set COPY, data set RESTORE, data set PRINT, DEFRAG, COMPRESS, and RELEASE commands. It allows serialization of data sets across processors with shared DASD, with JES3, and with the interface between dynamic allocation and JES3 enabled. Dynamic allocation is used by DYNALLOC to serialize data sets. Processing time increases because overhead is involved in dynamic allocation and serialization across multiple processors.

If you use DYNALLOC to serialize data sets (as opposed to ENQ) the job run time increases. If you use INDYNAM instead of DD statements to allocate DASD volumes you do not appreciably increase run time and coding of JCL, and command input is easier.

DFSMSdss does not honor DYNALLOC for HFS source data sets for either logical data set copy or logical data set dump.