Like many recent Linux releases, Mageia's installer supports btrfs, a copy-on-write file system with built-in support for subvolumes, filesystem-based RAID 0/1/10, online resizing, etc.
It is still under development, and not yet recommended for use in a production, but it is already the default file system on MeeGo, and is slated to be the default on Fedora 16.
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