Automatic Invocation of DFSMSdss Full Volume Dump

DFSMShsm automatically invokes DFSMSdss functions to dump DFSMShsm-managed user volumes and ML1 volumes. Each DFSMShsm-managed volume and each ML1 volume can be assigned a dump class that defines the following:

When and how to dump the volume
How often to dump the volume
How long to keep the dump copy

DFSMShsm can dump up to five concurrent copies of a volume in five dump classes. At least two concurrent copies are required to provide an on site and an off site dump tape. Each group of up to five concurrent copies of a volume is known as a generation. DFSMShsm maintains up to 100 generations of each volume.

DFSMShsm can dump up to 15 volumes concurrently. Each dump task selects its own dump tapes. The storage administrator selects the maximum number of concurrent tasks allowed.

DFSMShsm creates and maintains an inventory of the dump copies created. Figure 1 shows the dump paths of data sets managed with and without SMS.

Figure 1. Automatic dump and restore

For system-managed volumes, DFSMShsm uses the automatic dump attributes and dump class names specified in the storage group definition.

For non-system-managed volumes, DFSMShsm uses the volume automatic dump attribute and dump class names specified for the volume.