Tal, 

I can only speak of the IBM LTO4 tape drives, I assume the others are the same.
IBM says that each block of data to be written to the tape is compressed or not 
then encrypted. They do not compress blocks that would grow if compressed.

Regards len

-----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 Shekel 
Tal
Sent: Tuesday, March 02, 2010 8:39 AM
To: Justin Piszcz; Kevin C
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Sun/StorageTek based LTO4 encryption

I have also been looking at this as an option.
One of the considerations is the effect encryption has on compression.

I have heard you loose the ability to compress effectively when using
compression.

Have you noticed an effect on your tape drive compression when using
tape drive based encryption?

Regards,
Tal

-----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 Justin
Piszcz
Sent: 01 March 2010 21:26
To: Kevin C
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Sun/StorageTek based LTO4 encryption



On Mon, 1 Mar 2010, Kevin C wrote:

> Sorry if this topic is been discussed before.
>
> Looking for members who have implemented LTO4 based encryption on
> Sun/StorageTek/Oracle platforms, any useful
comments/journeys/guidance. We
> are on HP LTO4 drives with SL500/SL3000 libraries. From what I
understand,
> this pretty much limits us to the StorageTek Crypto Key Management
System w/
> KMA appliances at each library site. The other option, today, is
NetBackup's
> KMS software.
>
> Thank you.
>

I have using the IBM LTO-4 drives with STK libraries, works great, as
long 
the firmware is version 7BG2, I have seen the drive reset itself if the 
firmware is any other version (more recent ones).  Also using NBU & KMS.
It works good, note you can only have 2 volume pools that use
encryption.

Justin.
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