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 Forum index » Advanced Topics » Additional Software (PETs, n' stuff) » Filesystem
Why is deduplication not supported in ext4?
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ravish165

Joined: 01 Apr 2015
Posts: 1

PostPosted: Wed 01 Apr 2015, 08:28    Post subject:  Why is deduplication not supported in ext4?  

Deduplication feature is not supported in ext4 but it is in btrfs.

Being a stable and mature linux file system, what is the reason of not providing the feature in ext4.

Is it in the roadmap of ext4?
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Flash
Official Dog Handler


Joined: 04 May 2005
Posts: 13240
Location: Arizona USA

PostPosted: Wed 01 Apr 2015, 11:05    Post subject:  

Um, well, there's probably an ext4 forum or mailing list or something, where you can ask the developers and maintainers of ext4 why it doesn't support deduplication, whatever that is.
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Burn_IT


Joined: 12 Aug 2006
Posts: 3511
Location: Tamworth UK

PostPosted: Wed 01 Apr 2015, 12:54    Post subject:  

Deduplication is where the file system replaces repeated data with a pointer to the earlier occurrence.
It is used heavily in things like zipping where speed of execution is traded with file size.
I would imagine that where a file system needs/tries to be fault tolerant then deduplication would not be a good thing.

BTRFS is a lot newer design and has better fault tolerance built into the base design, however I suspect deduplication only occurs across files and not so heavily within files.

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