Thanks Terry.

I have also heard that EMC recommends converting the DataDomain to an NFS 
network-based storage device to get higher throughput from the hardware.   In 
that case the Networker server can write to it as an advanced file type device.

Can you comment on any such conversions?

Sent from my iPad


On Jan 4, 2011, at 8:51 AM, terry.lemons AT EMC DOT COM wrote:

> Agreed.  The deduplicating virtual tape drive 'maximum sessions' attribute 
> should be set to '1', to disable multiplexing (which is the ability to have 
> multiple concurrent streams sent to a single target device).  This is the 
> best practice for most/all deduplicating VTL implementations.
> 
> This is the opposite of a capability provided by some of the database 
> products, which is to support a single stream writing to multiple target 
> devices.  As far as I know, this should work just fine when sent to a 
> deduplicating virtual tape device.
> 
> Hope this helps.
> tl
> 
> Terry Lemons
> Backup Recovery Systems Division
> EMC²
> where information lives
> 
> -----Original Message-----
> From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] 
> On Behalf Of James Pratt
> Sent: Monday, January 03, 2011 12:08 PM
> To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
> Subject: Re: [Networker] DATADOMAIN AS VTL
> 
> afaik, DD VTL's cannot use multiple streams - this is because of the
> target-based de-duplication, and is also why EMC has you add many more
> VTL drives than normal - in order to compensate for less streams.
> 
> I think to a DD VTL, anything you send to it is just a datastream/data
> to be de-duped once it gets there , so I'm not seeing how MSSQL could be
> any different. :\
> 
> cheers,
> James
> 
> -----Original Message-----
> From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] 
> On
> Behalf Of Venkat Tudi
> Sent: Monday, January 03, 2011 11:52 AM
> To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
> Subject: [Networker] DATADOMAIN AS VTL
> 
> Hi All,
> My understanding of Datadomain as VTL is once configured each vitual
> tape drive can only do single stream. But we had some EMC come in to
> give us some briefing on SQL module and they mentioned that we can do
> multistreaming.
> So I double checked my configuration
> SAVEGROUP parallelism is 0 (means write as many stream as the clients
> give) Client Parallelism: 12 Target sessions on the Tape drive is set 4.
> SAVESET is MSSQL:
> 
> But I am still seeing single stream.
> I tested the same conguration to Physical Tape and I am seeing 4
> streams.
> Am I missing some thing or the guy gave the briefing is talking
> something incorrect.
> 
> 
> --
> Venkat Tudi
> 
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