The BACKVOL command requests that DFSMShsm backs up eligible data sets from specific SMS-managed volumes or from the volumes in one or more storage groups. Only those data sets for which the management class allows command backup are processed. The frequency of backup for an SMS-managed data set is obtained from the data set management class attribute.
When you issue the BACKVOL command for an SMS-managed volume, that volume becomes DFSMShsm-managed. DFSMShsm maintains control records for the volume until you issue the DELVOL command against it. When processing a BACKVOL command having the STORAGEGROUP parameter, the management class selection criterion that is used is AUTOBACKUP instead of COMMAND. This means that DFSMShsm treats a BACKVOL STORAGEGROUP command as if it is autobackup running for the referenced volumes.
The BACKVOL command requests DFSMShsm to dump specific SMS-managed volumes or volumes in one or more storage groups. When a BACKVOL command with the DUMP parameter is issued for an SMS-managed volume, the dump functions performed for the volume are the same as those performed for an automatic dump of that volume.
If dump classes are specified on the BACKVOL command, those dump classes are used to perform the dump function, overriding the dump classes defined for the SMS storage group associated with that volume.