[CentOS] RAID5 or RAID50 for database?

> Your way has the advantage of letting you add disks in pairs, but to get 
> that you get only single-disk redundancy: if a second disk goes out, 
> your array is gone, no matter which disk it is.

Nah, if you lose both disks that belong to the same stripe array, the 
other stripe array is still around.