Allow backups to span disk

This property allows backups to span disk volumes when one disk volume becomes full. The default is that this property is enabled.

The Allow backups to span disk property does not apply to AdvancedDisk or OpenStorage storage units. Backups span disk volumes within disk pools automatically.

The following destinations support disk spanning:

A BasicDisk storage unit spanning to a BasicDisk storage unit. The units must be within a storage unit group.
An OpenStorage or AdvancedDisk volume spanning to another volume in the disk pool.

For disk spanning to occur, the following conditions must be met:

The storage units must share the same media server.
The multiplexing level on spanning storage units should be the same. If there are any differences, the level on the target unit can be higher.
A disk staging storage unit cannot span to another storage unit. Also, a disk staging storage unit is not eligible as a target for disk spanning.
Disk spanning is not supported on NFS.