RAID protection for array LUNs
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Storage arrays provide RAID protection for the array LUNs that they make available to ONTAP. ONTAP does not provide RAID protection.
ONTAP uses RAID0 (striping) for array LUNs. ONTAP supports a variety of RAID types on the storage arrays, except RAID0 because RAID0 does not provide storage protection.
When creating RAID groups on storage arrays, you need to follow the best practices of the storage array vendor to ensure that there is an adequate level of protection on the storage array so that disk failure does not result in loss of data or loss of access to data.