SETMIG command: Changing the space management status of non-SMS-managed data sets or volumes

The SETMIG command changes the space management status of a specific data set or group of data sets on level 0 volumes. It can also change the space management status of a specific primary volume. You use this command to temporarily change the type of space management for specific cases.

You can change the space management status in three ways:

Data set migration only by command
Command and automatic space management
No command or automatic space management

If you specify a value for DATASETNAME(dsname), you do not have to repeat the SETMIG command each time you start DFSMShsm. But if you specify a value for LEVEL(qualifier) or VOLUME(volser), you must repeat the SETMIG command each time you start DFSMShsm.

SETMIG is not supported for SMS-managed volumes or data sets except to remove or restore the SYS1 and HSM data set qualifier restriction when using the LEVEL parameter. If an SMS-managed volume is specified, an error message is issued and no function is performed. The SETMIG command is processed for an SMS-managed data set, but it has no effect on the processing of the data set, because the space management status is determined by a data set’s management class attribute.