[CentOS] Is ext4 safe for a production server?

>> Write barriers were introduced to give data guarantees with hard drives 
>> that have their write cache enabled. Unfortunately, not everything has 
>> been given barrier support. LVM and JFS do not have write barrier support.
>>
>>     
>
> https://www.redhat.com/archives/dm-devel/2009-December/msg00079.html
>
> "Barriers are now supported by all the types of dm devices."
>
>   

Wunderbar!

Now if the IBM team will add barrier support to JFS...