If you are speaking about Centera--meaning CAS--and not Celerra, then I would 
suggest you read up on the Centera Backup/Recovery Module. CAS data is a 
different type of backup, and while it uses the NDMP engine, that isn't the 
crux of the situation, the CAS nature of the data is the main issue IMHO. 
Simply put, CAS data is not a normal file system, and the backup strategy 
should be different to accomodate that fact.

As for a single stream of NDMP data backing up at 40MB/second...I wouldn't 
expect that. If you are talking about a standard NAS (Celerra, NetApp, etc), 
there are often ways to get that performance. But I don't think that is the 
issue here.

Dave

Date:    Mon, 7 Mar 2005 10:18:01 -0600
From:    Rob Haig <rhaig AT RENEWDATA DOT COM>
Subject: NDMP speeds (with a centera if anyone has one)

We're looking at buying some Centera frames from EMC.  Our volume needs
make replication cost prohibitive, (both in hardware and offsite hosting
space) so we're looking at an offsite library that could do (almost
constant) NDMP backups of the data we'll be loading into the Centera.
The sales guy we're working is pushing replication (hmmm....) and
doesn't think that an NDMP client can push enough data for us (we'd need
to sustain about 40MB/s to keep up with our forecast needs). =20

=20

Does anyone have experience with how much data an NDMP client can push??
And has anyone done so with a Centera?

=20

Thx

--=20

Rob


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