ZDNet takes a look at the RAID capabilities of the btrfs Linux filesystem
In the second post, more on btrfs, I showed how btrfs filesystems can be dynamically resized, and can span multiple partitions and multiple devices (please remember that I am only trying to give an overview of btrfs functionality and use in these articles, and the authoritative source for information remains the Btrfs Wiki).Btrfs hands on: Exploring RAID and redundancy
Btrfs is a new file system for Linux, one that is still very much in development. Although I wouldn't exactly describe it as "experimental" any more, it is, as stated in the Wiki at kernel.org, "a fast-moving target."