![]() ![]() The performance penalty of RAID-DP is typically under 2% when compared to a similar RAID 4 configuration. 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. RAID-DP is proprietary NetApp RAID implementation available only in ONTAP systems. However, it is fairly easy to calculate parity against multiple groups of blocks, one can calculate all A blocks and a permuted group of blocks. For example, in our graph both RAID 5 and 6 consider all A-labeled blocks to produce one or more parity blocks. Rather, double parity calculates the extra parity against a different group of blocks. Differently, the second set is not another set of points in the over-defined polynomial which characterizes the data. Now part of RAID 6, double parity (sometimes known as row diagonal parity ) features two sets of parity checks, like traditional RAID 6. Diagram of a RAID-DP (double parity) setup
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