Ext4

[PDF] "1000 000 000 files: Scalability limits in Linux file systems" linuxcon2010, Ric Wheeler / Redhat

http://events.linuxfoundation.org/slides/2010/linuxcon2010_wheeler.pdf PDF slides that show what happens if you create a file system with one billion (10**9 ) files

[What linux file system does google use?] Answer: [Jfs-discussion] benchmark results

http://thread.gmane.org/gmane.comp.file-systems.btrfs/4311/focus=4342 Currently ext2, will move to ext4 . Read the discussion for more info