You are right, if client compression is turned on, you will get next to
no compression.

        In the DataDomain best practices for TSM documentation, they say
to have client compression turned off for the DD appliance to do its
thing.

        We don't have client compression turned on because we hate the
hit it takes on the clients and we have sufficiently big network pipes.
So we are set up OK for their appliance to work it's "magic".

Ben

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Wanda Prather
Sent: Wednesday, January 23, 2008 8:42 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Data Deduplication

Oooh, what a great question!
I'd guess if client encryption is on and working, the dedup ratio should
be about 1:1; because the data should never encrypt the same way twice.


On 1/23/08, lamont <tsm-forum AT backupcentral DOT com> wrote:
>
> 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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