[CentOS] Is ext4 safe for a production server?

> (...) The xfs kernel module offered by CentOS
> became kABI-compatible sometime ago -- meaning it survives kernel
> updates.

That is a clear improvement over the previous situation. I did suspect 
it but was not sure about it. Thank you for the information. I will do 
some tests with xfs, then.

> And, as of CentOS 5.4, xfs is now enabled in the kernel, so
> no need for any external kernel module. But yes, this is available for
> x86_64 only

... a decision that many people have trouble at understanding!