Allocating DFSMShsm data sets

The DFSMShsm data sets are the data sets DFSMShsm requires for full-function processing. The DFSMShsm data sets are not user data sets and they are not DFSMShsm-managed data sets. Rather, they are the following DFSMShsm record keeping, reporting, and problem determination data sets:

DFSMShsm control data sets
DFSMShsm control data set copies
Journal data set
Log data sets
Problem determination aid (PDA) log data sets
SDSP data sets (if used)

You, or the person who installed DFSMShsm on your system, probably have allocated these data sets during installation or testing of DFSMShsm. The data sets are required for the DFSMShsm starter set. For SMS environments, you must associate the DFSMShsm data sets with a storage class having the GUARANTEED SPACE=YES attribute so that you can control their placement. Data sets having the guaranteed space attribute are allocated differently than non-guaranteed space data sets, especially if candidate volumes are specified. Refer to z/OS DFSMShsm Storage Administration for a discussion of the guaranteed space attribute and for information about establishing storage classes.

You must prevent the following DFSMShsm data sets from migrating:

Control data sets
DFSMShsm log data sets
Journal
Problem determination aid logs

For more information about preventing DFSMShsm data sets from migrating, see Storage guidance for control data set and journal data set backup copies and Migration considerations for the control data sets and the journal.