Hello,
I have concerns about your implementation, not having enough capacity to 
hold  7-10 days worth of backups prevents onsite recovery initiative and 
in my opinion, why go the expensive route of VTL and the added complexity 
if you are not going to use most of it's benefits ?
If your VTL is capable of compression and dedupe, you should be able to 
hold lot more data.
As far as VTL being  parallel or back ( Transparent ) to Networker , i 
prefer the networker server to do the cloning vs VTL , this way you will 
have more choices and control over the processes.
A simple nsrclone script that lists saveset id and then performing clones 
should be the direction you need to explore, i am not a big fan of 
automatic cloning, also careful, planing of your pools, device allocations 
and balancing workload  should be considered to avoid hotsopts in backup 
environment, ensuring no cloning is happening over the network. ( i have 
seen this happen when read tape for clone is mounted on backup server 
while cloning ( writes) are  happening on Storage node and the data moved 
over the network) This can be avoided with some careful configuration of 
your storagenodes and cloning environmental.
HTH




anandhg <networker-forum AT BACKUPCENTRAL DOT COM> 
Sent by: EMC NetWorker discussion <NETWORKER AT LISTSERV.TEMPLE DOT EDU>
08/29/2008 03:13 AM
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Subject
Query in Staging from adv_file






We have recently got a VTL, HP VLS 12000, connected to HP EVA 4400 with 
9TB of usable capacity. I feel one disadvantage in VTL for our case. We 
are planing to use a VTL only as a caching device so as to act like an 
adv_file device. It is because our daily backup is 30TB and so we will 
move only few of the daily backups to VTL to fill only 50% of the VTL 
capacity.

I cannot have a staging policy for VTL devices. I have to move the 
savesets manually from the VTL to physical tape. What will be the best 
practice of moving the data from VTL to PTL. Is it Nwr has to do the 
cloning/staging part or some VTLs has the feature of moving the data from 
the virtual tape to physical tape. But in this case the VTL gateway will 
sit infront of the PTL and VTL.  Nwr will only see the VTL gateway as one 
library.

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