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Re: [zfs-discuss] why both dedup and compression?

Subject: Re: [zfs-discuss] why both dedup and compression?
From: Ian Collins
Date: Thu, 06 May 2010 15:39:58 +1200
On 05/ 6/10 03:35 PM, Richard Jahnel wrote:
Hmm...

To clarify.

Every discussion or benchmarking that I have seen always show both off, 
compression only or both on.

Why never compression off and dedup on?

After some further thought... perhaps it's because compression works at the 
byte level and dedup is at the block level. Perhaps I have answered my own 
question.

Data that don't compress also tends to be data that doesn't dedup well (media files for example).

--
Ian.

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