Is multipathing supported?
How do I select a path to use for my NDMP backups?
How do I select a path for File System backups?
While Multipathing is very common in SAN/NAS environments and network connectivity it is NOT supported for connecting NetVault to a tape library or tape drives.
Path selection for reading data during a File System or NDMP backup is NOT controled by NetVault. The path used to access the disks is determined by the OS of the server/san/nas and the hardware configuration.