<div dir="ltr"><div>Hat damn. I'll have to dig through that documentation on Monday.</div><div><br></div><div>Thanks again.<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 7 Jun 2019 at 16:57, Andy Smith via Nottingham <<a href="mailto:nottingham@mailman.lug.org.uk">nottingham@mailman.lug.org.uk</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi,<br>
<br>
Yes the feature on btrfs and xfs is block-level. I think the<br>
granularity is whatever the block size of the filesystem is, which<br>
defaults to 4KiB.<br>
<br>
I use it for deduplicated backups.<br>
<br>
<a href="http://strugglers.net/~andy/blog/2017/01/10/xfs-reflinks-and-deduplication/" rel="noreferrer" target="_blank">http://strugglers.net/~andy/blog/2017/01/10/xfs-reflinks-and-deduplication/</a><br>
<br>
Cheers,<br>
Andy<br>
<br>
On Fri, Jun 07, 2019 at 04:47:19PM +0100, J J via Nottingham wrote:<br>
> Thanks for the tips. Overlay is deffo an improvement as it will only take a<br>
> copy of a file if there is a change but it's still a full copy of the<br>
> entire file.<br>
> I am wondering if there's a way that XFS, ZFS or whatever can do something<br>
> even deeper and maintain partial/block differences or something.<br>
<br>
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