It aimed to improve reliability and performance, but also introduced some new concepts, like writable branch balancing, and other improvements – some of which are now implemented in the UnionFS 2.x branch. aufs was rejected for merging into mainline Linux.
它旨在提高可靠性和性能，但也引入了一些新概念，例如可写分支平衡和其他改进——其中一些目前已在UnionFS 2.x分支中实现。