Defining the backup environment for control data sets

When DFSMShsm is started, it gets environmental and function information from the parameter library (PARMLIB). The SETSYS, DEFINE, and ADDVOL commands that define the way in which DFSMShsm manages your data are in the PARMLIB member. (See Starter set example in the starter set for an example of the PARMLIB member ARCCMD00.)

In the following text, how to define the CDS and journal backup environment is discussed in a step-by-step fashion. The SETSYS CDSVERSIONBACKUP command determines how DFSMShsm backs up your control data sets. Subparameters of the CDSVERSIONBACKUP command allow you to specify:

The data mover that backs up the control data sets (DFSMSdss is recommended)
The number of backup versions to keep for the control data sets
The device type on which to store the backup versions of the control data sets
The names of the backup version data sets

SMS storage groups and management classes allow you to control other functions:

Prevent backup (outside of CDSVERSIONBACKUP) of the control data sets and the journal
Prevent migration of the control data sets and the journal
Specify that concurrent copy be used to backup the control data sets, assuming that the control data sets are on volumes connected to a controller that provides concurrent copy