Re: Deduplication

[Liu Bo <bo.li.liu@oracle.com>]

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.

> 
> - https://pypi.python.org/pypi/bedup says: "bedup looks for new and
> changed files, making sure that multiple copies of identical files
> share space on disk. It integrates deeply with btrfs so that scans are
> incremental and low-impact."
> 
> Is is file-based deduplcation only or is there also a block-based
> mode? Does not seem so according to the docs.

Both inband dedup and offband dedup patchset are floating on the list, and
inband is block-based, but I'm not sure about offband dedup.

-liubo

> 
> If so, what is the advantage to numerous other tools that replace
> duplicates by hard links? Performance?
> 
> Thanks,
> 
> Florian
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