You can use the EDG_EXIT100 installation exit to assign vital record specification management values to new tape data sets. When a volume is opened, DFSMSrmm records the vital record specification management value you assign to new tape data sets. You then define vital record specifications using data set name masks that match the vital record specification management values you define for special dates. These vital record specifications define the management policies for volumes with special dates and are considered for matching during VRSEL processing for volumes that use the VRSEL retention method.

You can use vital record specification management values to be the basis for assigning management class for system-managed tape. DFSMSrmm calls EDG_EXIT100 to obtain a vital record specification management value. During pre-ACS processing, the vital record specification management value is passed to your ACS routine to so that allocation decisions can be made. During OPEN processing for new tape data sets, this call is optional call and is not made for a non-system-managed tape data sets if you have assigned a management class during the RMMVRS ACS call.