I could be shot for saying the following, but using a NFS share would
provide the opportunity for you to remove the backup application and its
associates hardware from the data protection stack altogether for things
such as data bases which in some shops is 80% of the load.  

We are avid TSM users and fans but if RMAN backups directly to NFS
mounts works well it appears there would be an opportunity reducing
complexity and costs.

Charles 

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Nobody
Sent: Thursday, August 26, 2010 5:18 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Data Domain: Data Domain, and SQL-Backtrack with
Sybase databases

The last time I checked <10% of DD customers use the VTL option.  I'm
willing to bet that 60-80% of those are TSM customers.   The TSM folks
I've
talked to seem to prefer using VTL over file-type devices, which may
explain that.  The rest of the world (except large enterprise customers)
tends to prefer NAS devices.

On Thu, Aug 26, 2010 at 1:38 PM, ADSM-L <tsm AT networkc.co DOT uk> wrote:

> Curtis,
>
> >> Data Domain has good market share, but very few DD customers use
VTL.
>
> Really? That surprises me a little (i.e., the marginalised VTL usage) 
> and isn't necessarily representative of the TSM customers I've spoken 
> to or worked with using DDRs, many of whom still use the VTL 
> functionality. I can't comment on whether this is so much the case 
> with shops that use other backup software though (e.g., I know NBU has
its own OST interface).
>
> In any case, whether through VTL or NFS/CIFS the principle is the same

> and of course you're right, pre-appliance compression or even 
> encryption can be catastrophic to data de-dupe ratios. Without knowing

> any more, it sounds like you may have to make a compromise somewhere 
> without changing your current config Nancy, either in terms of backup 
> data storage footprint or RPO.
>
> Cheers,
> __________________
> David McClelland
> London, UK
>
> On 26 Aug 2010, at 19:10, Nobody <wcplists1 AT GMAIL DOT COM> wrote:
>
> > Data Domain has good market share, but very few DD customers use 
> > VTL.
>

This e-mail, including attachments, may include confidential and/or
proprietary information, and may be used only by the person or entity
to which it is addressed. If the reader of this e-mail is not the intended
recipient or his or her authorized agent, the reader is hereby notified
that any dissemination, distribution or copying of this e-mail is
prohibited. If you have received this e-mail in error, please notify the
sender by replying to this message and delete this e-mail immediately.