Take a look in the admin manual for 7.3/7.4 under NDMP. It describes
various scenerios including what Legato calls DSA (or data server agent)
which allows you to backup via NDMP over your network to your Legato
Storage Node/Server. We are doing exactly that with good results.
However, if you go that route, I strongly recommend configuring extra
network cards in your NetApps and your backup server so you can run
Jumbo Frame and can make other tcp optimizations. For example on our
Solaris Legato server we have:

#!/bin/sh

PATH=/bin:/usr/sbin:/usr/sbin;export PATH

ndd -set /dev/tcp tcp_max_buf    4194304
ndd -set /dev/tcp tcp_cwnd_max   2097152
ndd -set /dev/tcp tcp_xmit_hiwat 1048576
ndd -set /dev/tcp tcp_recv_hiwat 1048576
ndd -set /dev/tcp tcp_tstamp_always 1
ndd -set /dev/tcp tcp_wscale_always 1


in a startup script to set tcp parameters for DSA for better
performance. However, switching to jumbo frames on a private backup
network was the biggest win. 


----
Matthew Huff       | One Manhattanville Rd
OTA Management LLC | Purchase, NY 10577
www.otaotr.com     | Phone: 914-460-4039
aim: matthewbhuff  | Fax:   914-460-4139

-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of Henry Ferrara
Sent: Wednesday, October 17, 2007 2:45 PM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] NDMP Tape server under Networker 7.3 or 7.4


  It has been a while since I worked in Networker so I apologize in  
advance if my questions seem obvious to some.  But here goes anyways...

  We have several Netapp appliances (Ontap 6.5.X and 7.X) and I am  
assisting our backup admin on how to re-architect our Network  
environment to backup the the Netapps via NDMP.

   I understand the various configurations that essentially "attach"  
tape devices to the filers directly (either via scsi, fiber direct or  
SAN).  Then network initiates the backup and "causes" the filer to  
run dump to the "locally" attached tape device.  So file index  
information goes over network to Networker server and data goes from  
filer direct to tape.

   However, I am wondering if there is a way to have the filers send  
the backup data to a Networker server directly and have the networker  
server write the data to tape.  The primary driver for wanted to do  
something like that is that our tape library is not located  
physically close enough to one of our filers to allow fiber  
connecting the library.  (There are other reasons but that alone is  
enough to prompt the question).

   I did some searching and I saw a description for an old product  
that Legato had called SnapImage that has as one of its capabilities  
- the ability to act as a NDMP Tape Server.  Which it seems like this  
would be exactly what I would need.  If I could have a system (or the  
better yet the Networker server) act as a NDMP tape server than I  
would think I could have the filer send its data via NDMP across the  
network instead of locally attached tape devices.

   I think SnapImage was discontinued or replaced by PowerSnap (or  
something like that) and I did not see in the documentation any  
reference to the capability of running a NDMP Tape Server.

   Does Networker have the ability to act as a NDMP Tape Server as  
part of the 7.x?  Or as an add-on module?  And am I correct in my  
thoughts that if Networker did act as a NDMP Tape server the filer  
backups would act as I describe above?   And lastly where in the  
documentation (or on the web) can I find further information on this  
type of set up?

Thanks in advance,

   Henry


---
Henry Ferrara
hjferrara AT comcast DOT net

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