Hi Brett,

We currently have approx 40TB worth of Data Domain in our envrionment based
on 460's, 560's, and 510s.  They work great and generally see an average of
10x compression.  If you are backing up any Virtual Machines we have seen
compression ratios as high as 135x.  Mind you this is with the backup of the
vm not being compressed before being dumped to the DD.  Support from DD has
been excellent and we will continue to grow our infrastructure over the next
few years. Client side Dedup in software over a LAN just seems silly as it
requires process cycles on the client side.. it might make sense when
sending data over a WAN as you only send the deduped bytes. That being
said.... we use DD boxes in each remote region so since we own the LAN there
is no worries about bandwidth usage and the DD boxes replicate over the WAN
to the same effect.  Having a dedicated device that does dedup on the fly
has worked great for us.  The only issue we have with Legato is its ability
to understand there are two sets of data somewhere that it didn't move
itself (post replication).

Graeme.

On 11/1/07, Brett Monroe <mr.bmonroe AT gmail DOT com> wrote:
>
> Hey all,
>
> We are currently in the planning phase of dramatically transforming out
> data
> center's backup environment from the stone age (direct-attach tape drives
> on
> all servers doing fulls every night) to a more modern approach of
> centralization.  We are also looking to implement a data De-Duplication
> device in the mix but the offerings seem...immature.  I was wondering if
> any
> of you fine folks have any experience with any of de-duping technology
> whether it's client based software (Avamar) or something that sits in
> front
> of a backup disk device (Data Domain, Diligent, etc).  I'd be very
> interested in hearing what your experiences have been.
>
> Thanks
> --Brett
>
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