David,

This is a celerra limitation. There is a maximum of 4 concurrent connection per 
data mover.

See the guide configuring NDMP backups on celerra:

Restrictions
When configuring your Celerra Network Server for NDMP backups, note the 
following restrictions.
General Restrictions
◆ EMC supports NDMP drive sharing through a storage area network (SAN) only.
◆ You can configure a Celerra Network Server host as either an NDMP client or a 
HighRoad(r) client, but not as both.
The Celerra Network Server uses port 10000 for NDMP operations. Ports 10001 
through 10004 are used for NDMP three-way backups and restores.
◆ If you plan to turn on Internationalization, you should do so before, not 
after, you create your file systems.
◆ Stripe size on your storage system can affect backup performance. For optimal 
backup stripe size settings on Symmetrix(r) and CLARiiON(r) systems, refer to 
the EMC NAS Interoperability Matrix.
◆ The Celerra Network Server supports a maximum of four concurrent backups per 
NDMP-Host Data Mover.
◆ An NS Series Celerra Network Server requires a media interface adapter (MIA) 
for device connection to the AUX-0 port.
Instructions on installing an MIA in an NS series Celerra are documented in 
individual setup instructions provided with each system. 

Regards,

_______________________________________
Frédéric Tremblay, B.Sc.A
Storage Administrator
Canadian Space Agency
E-mail : [frederic.tremblay AT space.gc DOT ca]
Web site : [www.space.gc.ca]





-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] 
On Behalf Of David Dulek
Sent: Tuesday, August 01, 2006 17:38
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] Cellera NDMP Backups

Are you backing up the data to a adv_file or file device or to tape?
Are the device(s) local to the Celerra or the backup/storage node?

On Tuesday 01 August 2006 15:55, Jeff Wade wrote:
> We are a Windows Networker 7.2.1 shop with a new EMC Celerra running 
> OS 5.4.  We are being killed by the Celerra data mover's 4 stream limitation.
> We are finding that Networker does not queue streams beyond 4, they 
> fail with a data mover connection error.  Is anyone out there 
> scripting around this or have any better ideas on how to get around 
> the limitation?  How are you backing up multiple file systems within a 
> nightly window?
>
> Thanks!
> Jeff
>
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