Google is apparently in the process of migrating their current EXT2 file-systems over to the more current EXT4 file-system (Ubuntu 9.10 uses it by default)
This was brought up in a JFS benchmarking discussion. Google’s Michael Rubin shared that they chose EXT4 after benchmarking it as well as XFS and JFS (possibly with our Phoronix Test Suite carrying out some of the testing, which they have used in other areas). Their results showed EXT4 and XFS performing close to one another, but with it being easier to upgrade from EXT2 to EXT4 rather than EXT2 to XFS, they went with the easier path. Btrfs is still too experimental for Google to even consider that an option at this point.
Also they have now hired the main developer behind EXT4: Ted Ts’o
Will Google become even faster with processing large quantities of data, and displaying them to the end-user?