We backup about 16Tb of data over the course of a weekend.  We used to run NBU 
6.0 MP2 with four LTO3 drives fiber connected.  We recently changed to NBU 
6.5.3 and a disk to disk appliance... we now vault from the disk images (DSU) 
to tape for offsite storage and DR.  By my estimates the drives used to copy at 
roughly 62 Gb/Hr multiplexed.  So we would be finished over the course of a 
weekend.  Now that we are vaulting from disk to tape, the tape drives cannot 
multiplex from disk to tape.  My vault jobs take extremely long to finish and 
if a drive is busy when the vault job begins then it only runs on the remaining 
available tape drives (which for us, we have two tape storage groups with two 
drives in each one based on what master/media they belong to) so when something 
happens to one drive I end up copying images for half of my environment to one 
tape drive.  The drive non-multiplexed are copying at about 30-35 Gb /Hr.  
Moving to a disk replication would solve this but my DR
  plan is a cold site so I have to keep tape.  Is there anything I can do to 
improve this performance?

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