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RAID protection levels for disks
Data ONTAP supports two levels of RAID protection for aggregates composed of disks in native disk shelves: RAID-DP and RAID4. RAID-DP is the default RAID level for new aggregates.
For more information about choosing RAID protection levels, see Technical Report 3437: Storage Best Practices and Resiliency Guide.
Related Link:  
TR 3437: Storage Best Practices and Resiliency Guide

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