Specifying when automatic secondary space management starts

The SECONDARYSPMGMTSTART parameter of the SETSYS command controls the processing window of automatic secondary space management.

You can run automatic secondary space management any time of the day except when automatic primary space management is running (if SDSPs are used).

Example: To define a processing window of 12:30 a.m. to 2:00 a.m., use the following command:

SETSYS SECONDARYSPMGMTSTART(0030 0200)

Although secondary space management ending time is 2:00 a.m., any data set deletion management work elements (MWEs) that secondary space management built up to 2:00 a.m. would still continue to be processed. If a large number of data sets needed deletion, MWE processing could continue for a significant time after secondary space management stops building data set deletion MWEs.

Note:

You must specify SECONDARYSPMGMTSTART if you want it to run; it will not run by default.
Data set deletions generated by SSM are processed after any user recalls or user generated deletions.
Backup of the CDSs can interfere with the starting of automatic secondary space management. See Phase 1: Backing up the control data sets for discussion of this consideration.