Off the top of my head:

1) dsmserv will auto sense drives and paths for devtype=VTL
2) Some waits for operation completion are shortened when you tell TSM it's
all virtual, not real.

The latter is the larger benefit, of course.

I haven't seen any drawbacks to VTL.

Nick

On Friday, August 2, 2013, Robert Ouzen wrote:

> Hi to all
>
> I have on a TSM server 6.3.4 with  O.S Windows 2008 R2 64B , a library for
> my Data Domain storage.
>
> For now my libr DDVTL in on type library type=scsi  (history)
>
> I am occur that in version 6 is an another option of library type= VTL
>
> Don’t quiet understand the difference ?
>
> What will be best option , I backup thru Data Domain with device type FILE
> and LTO (VTL)
>
> Best Regards
>
> Robert
>