To define an Object or Object Backup storage group, use the ISMF Storage Group application. Use SETOAM statements in the CBROAMxx PARMLIB member to specify the tape-related options that can supplement or override these ISMF specifications for the Object or Object Backup storage group definitions.

If a tape unit name is associated with an Object or Object Backup storage group on the SETOAM statement in the CBROAMxx PARMLIB member, the backup copies are written to tape volumes. In this instance, any optical libraries that are associated with the Object Backup storage group that is defined using the ISMF storage group define panel are ignored for writing backup copies of objects to that Object Backup storage group. If the SETOAM statement does not direct the Object Backup storage group to tape media, OAM writes the backup copies to optical media. Additionally, if there is no SETOAM statement in the CBROAMxx PARMLIB member, then OAM automatically writes the backup copies to optical media.

Other information that is supplied by the CBROAMxx PARMLIB member can supplement or override the ISMF information that is assigned to the Object or Object Backup storage group.

If an Object or Object Backup storage group belongs to an OAM that is a member of an OAMplex, it can be connected to more than one system in an SMS complex. The libraries that are defined for these storage groups can also be connected to multiple systems within the OAMplex. If the OAM is not part of an OAMplex, each Object or Object Backup storage group can be connected to only one system in the SMS complex.

For information on changing the SETOAM values dynamically and on defining the values when the CBROAMxx PARMLIB member is not used at initialization, see Using the UPDATE command to set SETOAM, SETOSMC, and SETOPT values.

For more information on assigning backup copies of objects to various media types, see Determining which media to use for backup copies.