Re: [Networker] Query in Staging from adv

Perhaps NW has gotten smarter about dealing with VTLs in 7.4 and I don'thave a VTL so take what I say with a large grain of salt!

If I was to go with a VTL, I would not allow the VTL to write thephysical tapes. I would have NW control the physical tapes as well asthe virtual tapes. I do not want to get into the situation where theVTL has copied a virtual tape (VT00001) out to a physical tape (VT00001)and then NW recycles that tape in the VTL and uses it again. NW has nowlost track of the data that is on the physical VT00001. If you cankeep NW from ever recycling the virtual tapes so that it never losestrack of the data on the physical tapes, then you'll be ok.

Much easier (in my mind) to have NW stage the data from the virtualtapes to a different physical tape. Doing that means that you can havesmall virtual tapes and large physical tapes and not waste tape mediaand according to recent discussion here, increase performance on the VTLand decrease the risk of virtual tape contention.


Frank

On 8/29/08 4:13 AM, anandhg wrote:

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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Re: [Networker] Query in Staging from adv_file