Dell PowerVault DR2000v - Manual (Page 43)

43 Setting up NetVault Backup Native Virtual Tape Library on the Dell™ DR4X00 Disk Backup
Appliance
Restores can be read and new backups will be written to the new container. Once
the first DR4X00 is back online, the new container on the second DR4X00 can be
replicated to the first DR4X00 and when needed, the process of changing the
devices paths can be repeated to insure access to the VTL.