Dwayne,

I have exactly this setup  plus some three way backup too.
SSO works perfectly, I can't complain at all.
I share drives between filer only as I do not have standard backups.
I have not tuned anything. It would be nice if it is possible.

Overall average speeds from Netbackup I see as 40-70 Mbs.
But this is not a true speed as NetBackup start timing when it requests
NDMP dump. However NetApp builds snapshot first and this can take few
minutes depending on your filer. NDMP dump when it start is slow at
first but after a while it reaches peak speeds of 120-130 MBs. 
How fast it can dump data to a tape depends on what kind of data is
being dumped: binary data with small number of files is blazingly fast
whereas dump of millions of small files is quite slow.

--Rajmund


-----Original Message-----
From: veritas-bu-bounces at mailman.eng.auburn.edu
[mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of Adams,
Dwayne
Sent: Friday, April 06, 2007 8:22 AM
To: veritas-bu at mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] NDMP performance tuning on LTO 3 drives

Hello,

I am working on setting up NDMP v4 backups using Netbackup 6.0 with LTO3
drives.  The drives will be SAN attached to the filers.  Can anyone
provide any information on their experience with performance tuning with
NDMP?  Can you achieve native speed+ with directly attached LTO3 tape
drives? Also, how well does SSO work when you share the drives between
your media servers and the filers?

Thanks in advance.

Dwayne Adams


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