Lot of data.  I come up with 3.5 TBs a day from your figures! Gut feeling is
that you couldn't keep up with it through NDMP. You'd have to have lots of
NDMP tape servers and tape drives.  We have not done Centera Backups yet but,
will start soon so 


On another Centera note.  You also need to worry about object counts.  The A
single Centera node/cluster has a limit of 400 million  C-clips (the basic
storage object in a Centera).  Depending on how your software interfaces with
the Centera you might want to take that limit into account.  Some software
(Email Xtender for example) roll all the emails up into a big file then write
to the Centera.  Some just push the original objects on to it.  SO each
c-clip is say a document , image or whatever.  I'd make sure you forecast the
number of c-clips on the system and architect the Centera system around it.
You may need more access nodes etc if this is the case.

http://searchstorage.techtarget.com/originalContent/0,289142,sid5_gci1052147,
00.html?track=NL-390&ad=503730&Offer=W2MYnv4

Hope this helps.

Brian Narkinsky






-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] 
On
Behalf Of Rob Haig
Sent: Monday, March 07, 2005 11:18 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] 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).  

 

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

 

Thx

-- 

Rob



Confidentiality Notice: The information contained in this e-mail from Rob
Haig and any attachments is legally privileged or otherwise confidential. If
you are not an intended recipient, you are hereby notified that any
dissemination, distribution or copying of this e-mail is strictly prohibited.
If you have received this e-mail in error, please notify the sender and
permanently delete the e-mail and any attachments immediately. Thank you in
advance for your cooperation. 3/7/2005 10:18 AM

--
Note: To sign off this list, send a "signoff networker" command via email
to listserv AT listserv.temple DOT edu or visit the list's Web site at
http://listserv.temple.edu/archives/networker.html where you can
also view and post messages to the list. Questions regarding this list
should be sent to stan AT temple DOT edu
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=

--
Note: To sign off this list, send a "signoff networker" command via email
to listserv AT listserv.temple DOT edu or visit the list's Web site at
http://listserv.temple.edu/archives/networker.html where you can
also view and post messages to the list. Questions regarding this list
should be sent to stan AT temple DOT edu
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=