Aufs

aufs (AnotherUnionFS in version 1, but advanced multi layered unification filesystem since version 2) implements a union mount for Linux file systems. Developed by Junjiro Okajima in 2006, aufs is a complete rewrite of the earlier Unionfs. It aimed to improve reliability and performance, but also introduced some new concepts, like writable branch ...
Found on http://en.wikipedia.org/wiki/Aufs
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