In a JES3 sysplex, DFSMShsm normally delays across two midnights before issuing a PARTREL (directed by management class) to release over-allocated space in new generation data sets. If a JES3 account protects its data sets by using multiprocessor serialization (sending the SYSDSN resource around the GRS ring) rather than using JES3 data set reservation, this delay is unnecessary. To disable this delay, enter the following command:

PATCH .MGCB.+27 BITS(.......1)