Is there a block-level storage file system?

MappaM Published at Dev

MappaM

I'm looking for a file system that stores files by block content, therefore similar files would only take one block. This is for backup purposes. It is, similar to what block-level backup storage proposes such as zbackup, but I'd like a Linux file system that allows to do that transparently.

Stephen Kitt

Assuming your question is about data deduplication, there are a few file systems which support that on Linux:

ZFS, with online deduplication (so data is deduplicated as it is stored), but with extreme memory requirements which make the feature hard to use in practice;
Btrfs, with “only” out-of-band deduplication, albeit with tightly-integrated processes which provide reasonably quick deduplication after data is stored;
SquashFS, but that probably doesn’t fit your requirements because it’s read-only.

XFS is supposed to get deduplication at some point, and Btrfs is also supposed to get online deduplication.

Keep an eye on Wikipedia’s file system comparison to see when this changes.

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edited at2021-04-10

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Is there a block-level storage file system?

Is there a block-level storage file system?

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