Google adopts ext4

[Gary Wilson]

 From phoronix.com today:

Google is in the process of migrating their EXT2 file-systems over to 
the modern EXT4 file-system. 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). 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. ...

Google also happened to just hire Ted Ts'o, the widely known Linux 
kernel developer who is largely responsible for the EXT4 file-system 
work. According to a blog comment, one of the first things he will be 
working on while enjoying the Googleplex is EXT4.