Is ext4 safe for a production server?

[Miguel Medalha <miguelmedalha@xxxxxxx>]

I am about to install a new server running CentOS 5.4. The server will 
contain pretty critical data that we can't afford to corrupt.

I would like to benefit from the extra speed and features of a ext4 
filesystem but I don't have any experience with it.
Is there some member of the list who can enlighten me on whether ext4 is 
mature enough to be used on a production server without too much risk?

Thank you!
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