> 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?
> 
> *********************
> 
> This is exactly what I found, and SLP (storage lifecycle policies) are my 
> solution. 
> You set up the SLP to backup to disk pool A as step one, and have a second 
> step that copies that from disk to tape pool B with your normal retention. 
> Essentially you get a one tape drive vault process, and no longer lose your 
> efficiency. 
> 
> *********************
> 
> So what I understand you are doing is using the SLP to get around the 
> boundaries of tape pools being assigned to a given media, this way all the 
> data gets backed up by a pool of all of the tapes as one group?  I assume 
> vault is the underlying technology but the SLP is just the layer at which you 
> configure and run it all.  Do you need the Shared Storage Option for this?  
> In your experience does the data get split across all of the drives evenly?  
> If one tape finishes its list of imiages does it just sit there or does NBU 
> find more data for it to backup? (similarly to how the resource manager would 
> do when we used to copy straight to tape)?
> I guess this could help keep my drives spinning, won't do much for my speed 
> issue but it seems like it could help with the data allocation... thanks for 
> your advice.
> 


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