I have successfully tested LTO4 encryption with Quantum i500 and their
version of encryption management software QEKM.
We use NDMP for backups and it depends what data we dumping to tape but
we were getting about 70MBs as reported by NBU which is what I would
expect.
However real speed of actual data dump was a little bit faster as NBU
does not eliminate NDMP overhead.
Overall I am satisfied with performance and we are starting to deploy
it.

--Rajmund 

-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of JAJA
(Jamie Jamison)
Sent: Thursday, December 06, 2007 3:54 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] LTO Generation 4 tape throughput with
on-driveencryption

I'm researching the purchase of a new library with LTO generation 4 tape
drives and am interested in using the on-drive encryption to encrypt my
backup tapes so that if a box of tapes ever falls off of the Iron
Mountain truck I'm not having to explain things to the board of
directors and legal, update my resume and/or both. The spec sheets for
the LTO-4 drives that I've seen claim throughput of up to 120Mbps, but
as we all know the devil is in the details and for all I know that
throughput could have consisted of writing extremely large files
consisting of nothing but the letter "e" to tape, without using
encryption. Has anyone upgraded to LTO gen 4 yet who is also using the
on-drive encryption and if so what kind of throughput do you see on
average. Any real-world, real-life information will be greatly
appreciated.
 
 
Thank You,
 
Jamie Jamison
ZymoGenetics, Seattle


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