I think that "post process vs. inline" is an important issue.

We evaluated both Netapp and Data Domain, before choosing the Data 
Domain solution.   One of reasons was that processing.

Post processing, means if you are writing 4 Tb of data on a weekend 
full, you have to have 4 Tb of free disk space to write it all, and then 
it will compress down.

In-line, means that as you write that 4 Tb of data, you only have to 
have the space for the de-duped/compressed image.

I won't shill for Data Domain, since they don't pay me, but...

-Andrew

Fergus Donohue wrote:
> Hi Justin,
> 
> Thanks for the feedback. They sell a NAS based de-dupe device very 
> similar in concept to Data Domain, but it does post-process rather than 
> in-line de-dupe. Price-wise they appear very competitive and I was 
> wondering if anyone had any real-world experience with them.
> 
> Thanks,
> 
> Fergus.
> 
> Justin Piszcz wrote:
>> Never heard of or used it myself Fergus.
>>
>> Justin.
>>
>> On Wed, 30 Jul 2008, Fergus Donohue wrote:
>>
>>   
>>> Should I take the resounding silence as a "no" then? ;)
>>>
>>> Thanks,
>>>
>>> Fergus.
>>>
>>> Fergus Donohue wrote:
>>>     
>>>> Hi all,
>>>>
>>>> The question has been asked here before, but things may have moved on
>>>> since. Has anyone deployed an Exagrid solution in production and if so,
>>>> how has it been?
>>>>
>>>> Thanks,
>>>>
>>>> Fergus.
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