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Degraded refers to a fallback mode that continues to allow the usage of the storage array, but at a lower performance level.

When a RAID array experiences the failure of one or more disks, it can enter degraded mode, a fallback mode that generally allows the continued usage of the array, but either loses the performance boosts of the RAID technique or experiences severe performance penalties due to the necessity to reconstruct the damaged data from error correction data.

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