Is it possible to change from Client Encrypt to Tape Device Encrypt?
(i.e. LTO4 / 3592 etc) The you're encrypting your offsite but your
onsite is now getting better "Factoring" compression ratios. 

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
lamont
Sent: Wednesday, January 23, 2008 11:18 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] Data Deduplication

Hi Curtis,
Unfortunately, this was already the case when I came, client encryption
is the only option and the tapes are needed to be sent to offsite.
I think we need to consider this - enabling/disabling client encryption
and see how - in the test case on the upcoming POC with a de-dupe
vendor.

Thanks.


cpreston wrote:
> The other posters are correct.  You will get 1:1.   Dedupe works by
> finding patterns.  There are no patterns in encrypted data.
>
> One question would be why would you do that?  Most people are 
> encrypting data as it leaves their site.  The best way to do that is 
> hardware encryption (tape drive or SAN-based).  Do that on the other 
> side of your dedupe box and before it goes to tape -- not at the 
> client -- and you'll have no issues with dedupe.
>
> ---
> W. Curtis Preston
> Backup Blog @ www.backupcentral.com
> VP Data Protection, GlassHouse Technologies
>
> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf 
> Of lamont
> Sent: Wednesday, January 23, 2008 12:29 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: [ADSM-L] Data Deduplication
>
> Hi,
> What would likely be the de-dupe ratio if tsm clients do archive 
> processing daily (file level, no tdps) with encryption enabled?
>
> Thanks.
>
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