sentences:  RAID DP implements RAID 4, except with an additional disk that is used for a second parity, so it has the same failure characteristics of a RAID 6.The performance penalty of RAID-DP is typically under 2% when compared to a similar RAID 4 configuration.RAID 5E, RAID 5EE, and RAID 6E (with the added "E" standing for "Enhanced") generally refer to variants of RAID 5 or 6 with an integrated hot-spare drive, where the spare drive is an active part of the block rotation scheme.