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Date: Mon, 26 Aug 2013 09:22:29 +0800
From: Liu Bo <bo.li.liu@oracle.com>
To: mpe <michele@unipex.it>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: Deduplication
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On Fri, Aug 23, 2013 at 12:04:10PM +0200, mpe wrote:
> On 23/08/2013 09:42, Liu Bo wrote:
> >Hi,
> >
> >On Thu, Aug 22, 2013 at 09:28:09PM +0200, Florian Lindner wrote:
> >>Hello,
> >>
> >>some questions regarding btrfs deduplication.
> >>
> >>- What is the state of it? Is it "safe" to use?
> >>https://btrfs.wiki.kernel.org/index.php/Deduplication does not yield
> >>much information.
> >
> >For inband dedup, it's experimental because it introduces some format changes.
> >
> 
> In our tests we are trying btrfs for our internal storage backup
> backend and we like a lot compression! Now would like to test inband
> dedup.

dedup can cope with compression, too.

> Does those patchs (are v6 the last?) can be used on ubuntu lts? Do
> have a simple howt-to to follow?

I didn't try ubuntu lts yet, but the v6 patch set can be well applied on
3.11-rc4.

To enable dedup, you need to
1) mount DEV /PATH_OF_MNT -o dedup (or -o dedup_bs=xxxK)
2) btrfs dedup register /PATH_OF_MNT
3) write your data now :)


Feel free to tell me if any questions, thanks.

-liubo