RAID protection levels
Data ONTAP supports two levels of RAID protection, 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.
- What RAID-DP protection is
If an aggregate is configured for RAID-DP protection, Data ONTAP reconstructs the data from one or two failed disks within a RAID group and transfers that reconstructed data to one or two spare disks as necessary.
- What RAID4 protection is
If an aggregate is configured for RAID4 protection, Data ONTAP reconstructs the data from a single failed disk within a RAID group and transfers that reconstructed data to a spare disk.
