[CentOS] Is ext4 safe for a production server?

> For enterprise environments my favorite FS is XFS, YMMV, though.
>   

I also thought about using xfs, but I don't like the idea of it being 
dependent of an external kernel module that is always lagging behind the 
current kernel version.

RedHat made the very questionable decision of NOT including the xfs 
module in the 32 bit flavor of RHEL 5.4...