We have used VTL's and tape drives together. Using real 9940 tape drive and the 
VTL, we have set up in-line backups and have found that the process is totally 
automated. All daily backups are written to VTL and the weekly and monthly 
backups are in-line backups. Every Monday there is a vaulting policy which 
writes the catalogue to tape. The catalogue tape and the weekly tapes are then 
ejected and sent off site.

The in-line solution is as slow as your slowest tape drive. We have seen that 
our weekly backups run at some 10% slower than the backups written directly to 
the VTL.

 
 
 
 
Kind Regards,
Clem Kruger
-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu 
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Paul 
Keating
Sent: 30 August 2007 15:54 PM
To: VERITAS-BU AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] NetBackup 6.5 VTL direct to tape

VTLs that copy data direct to tape without using a Netbackup media
server usually mirror the barcode IDs.

Basically, if you have a physical library with barcodes 000AAA to
999ZZZ, the VTL will inventory the library and create its own "virtual
cartridges" with the same barcodes.

Biggest problem is that you're stuck with a 1:1 relationship between
virtual and physical tape, in order to guarantee the data on the virutal
cart fits on a physical cart you have to assume really crappy
compression, which means, in most cases, your physical carts will never
be filled to capacity.

The idea then is that if the barcodes are identical, could can pull the
VTL out of the middle and go back to physical tape, and the catalog is
fine. Though in reality, depending on where you are in your destaging,
Netbackup might thing it has a lot of data on tape, that only made it to
virtul tape a didn't get down to the physical carts.

This type of VTL (Falconstor, for sure) should still allow you to
disable the destaging feature, and create unique bacodes on the VTL and
let your media servers vault from VTL to tape. That is Symantec's
recommended "best practice".

-- 


> -----Original Message-----
> From: veritas-bu-bounces AT mailman.eng.auburn DOT edu 
> [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf 
> Of drpaine10
> Sent: August 29, 2007 4:27 PM
> To: VERITAS-BU AT mailman.eng.auburn DOT edu
> Subject: [Veritas-bu] NetBackup 6.5 VTL direct to tape
> 
> 
> 
> I'm looking for information on how netbackup allows a VTL to 
> write directly to tape and still maintain the catalog 
> information of the second copy. Is it a requirement to line 
> up the physical and virtual tape id's ?
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La version française suit le texte anglais.

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