Penguin
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XFS is SGI's FileSystem optimised for "Enterprise use". What this means in practise is that it scales very well to Stupidly Huge Disks, with huge directories and huge files. It has some very interesting features, like dedicated high performance I/O areas, allowing you to dedicate part of your disk to files that you want very low latency to access, for example video files you are currently editing.

XFS isn't yet in the main kernel tree, which is unfortunate, it appears to be a very good mature file system.