> I don't really like the idea of having to reshuffle all the mirrors all
> of a sudden.

If keeping invariable directory structure is the goal (even though it
should be possible to shuffle files among the directories without having
to retransfer the whole tree with hard links) in addition to be able to
determine the target directory without knowledge of directory layout as
Robin mentioned in another thread[1]:

> As for the problem you describe, one of the requirements in the
> discussion is that given ONLY the file or filename, and NOTHING ELSE, it
> should be possible to determine where in a hierarchy it should go. No
> prior knowledge about the hierarchy was permitted.

then hashing is indeed a better option.

1. 
https://archives.gentoo.org/gentoo-dev/message/1d69d65b47a18fdbe36f5edac58c7591

---
Andrew

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