Because automatic dump is a volume function, the attributes that govern it are taken from the storage group. As Figure 1 shows, DFSMShsm copies the data sets from level 0 volumes to dump volumes. Dump can be performed only on complete volumes.
Restore, the reverse of dump, moves dumped data sets from dump volumes to level 0 volumes. There are conditions under which a data set, in contrast to a volume, can be restored.