[CentOS] RAID5 or RAID50 for database?

>We plan to configure 4 disks (5,8,9,10) as RAID5 or RAID50.  This logical volume will be use as file systems and store database backup files.

I wouldn't use Raid 5 on a DB, the performance degradation during rebuild and low fault tolerance aren't appealing to me.
jlc
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