Understanding how RAID protects your data and data availability can help you administer your storage systems more effectively.
For native storage, Data ONTAP uses RAID-DP (double-parity) or RAID Level 4 (RAID4) protection to ensure data integrity within a RAID group even if one or two of those drives fail. Parity drives provide redundancy for the data stored in the data drives. If a drive fails (or, for RAID-DP, up to two drives), the RAID subsystem can use the parity drives to reconstruct the data in the drive that failed.
For array LUNs, Data ONTAP stripes data across the array LUNs using RAID0. The storage arrays, not Data ONTAP, provide the RAID protection for the array LUNs that they make available to Data ONTAP.