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Storage : Aggregates : Understanding aggregates : How Data ONTAP uses RAID to protect your data and data availability
How Data ONTAP uses RAID to protect your data and data availability
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 group of disks even if one or two of those disks fail. Parity disks provide redundancy for the data stored in the data disks. If a disk fails (or, for RAID-DP, up to two disks), the RAID subsystem can use the parity disks to reconstruct the data in the drive that failed.
For third-party storage, 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.

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