[Nottingham] Copy without copying?

[Andy Smith]

Hi,

Yes the feature on btrfs and xfs is block-level. I think the
granularity is whatever the block size of the filesystem is, which
defaults to 4KiB.

I use it for deduplicated backups.

    http://strugglers.net/~andy/blog/2017/01/10/xfs-reflinks-and-deduplication/

Cheers,
Andy

On Fri, Jun 07, 2019 at 04:47:19PM +0100, J J via Nottingham wrote:
> Thanks for the tips. Overlay is deffo an improvement as it will only take a
> copy of a file if there is a change but it's still a full copy of the
> entire file.
> I am wondering if there's a way that XFS, ZFS or whatever can do something
> even deeper and maintain partial/block differences or something.

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