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RAID types
RAID-DP provides double-parity disk protection. RAID4 provides single-parity disk protection against single-disk failure within a RAID group.
With RAID4, if there is a second disk failure before data can be reconstructed from the data on the first failed disk, there is data loss. To avoid data loss when two disks fail, you can select RAID-DP. RAID-DP provides two parity disks to protect you from data loss when two disk failures occur in the same RAID group before the first failed disk can be reconstructed.
For array LUNs, Data ONTAP uses RAID0 RAID groups to determine where to allocate data to the LUNs on the storage array. The RAID0 RAID groups are not used for RAID data protection. The storage arrays provide the RAID data protection.

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