APFS cloning not working across volumes inside same container?
APFS cloning not working across volumes inside same container?
- Subject: APFS cloning not working across volumes inside same container?
- From: Thomas Tempelmann <email@hidden>
- Date: Mon, 06 May 2019 15:21:54 +0200
I was just looking into making a Deduplication tool for macOS / APFS.
One common scenario would be to deduplicate macOS systems on separate
volumes. Like, for us developers who have several macOS versions on their
computers for software testing purposes.
I thought I could save a lot of space by having files inside /System and
/Library share the same space by relying on APFS's cloning feature.
However, when I tested copying a file from one volume to another volume,
both being in the same APFS container (partition), Finder would still copy
the data instead of doing the clone thing.
Now I wonder if that's just a shortcoming of the Finder or a problem with
the macOS API.
After all, since APFS shares a single catalog between all volumes of its
container, cloning should be possible across volumes, shouldn't it?
--
Thomas Tempelmann, http://apps.tempel.org/
Follow me on Twitter: https://twitter.com/tempelorg
Read my programming blog: http://blog.tempel.org/
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