NetApp
Cluster-Mode System Manager Help : Cluster-Mode : Cluster > Storage > Aggregates : Understanding aggregates : RAID protection levels for disks
RAID protection levels for disks
Data ONTAP supports two levels of RAID protection for disks in native disk shelves, RAID-DP and RAID4. RAID-DP can protect against double-disk failures or failures during reconstruction. RAID4 can protect against single-disk failures. You assign RAID level on a per-aggregate basis.
For more information about choosing RAID protection levels, see Technical Report 3437: Storage Best Practices and Resiliency Guide.