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RAID Controller Health Check (NAS)

The health check is essential to detect and prevent potential issues that could lead to data loss or degraded performance. Here are some key aspects of a RAID controller health check

(File Sharing & Data backup and redundancy)

RAID Array Status

The health check should verify the overall status of the RAID array, ensuring that it is in a healthy and operational state. This involves checking for any failed or degraded drives, as well as the overall status of the RAID configuration (e.g., RAID 0, RAID 1, RAID 5, RAID 6, etc.).

(Raid Status Image)

Drive Health

The health check should assess the individual drives connected to the RAID controller. It looks for signs of drive failures, bad sectors, or other physical issues that could impact the reliability of the storage system.

(Drive Health Image)

Case Study NAS Degraded Mode

NAS drive in a RAID array fails, the RAID controller or NAS device detects the failure and marks the affected drive as "failed" or "degraded." Depending on the RAID configuration, the array may still continue to function with limited functionality.


  • Drive Replacement: Identify the failed drive and replace it with a new, functional one of the same capacity and specifications. The RAID array will automatically initiate the rebuilding process.

  • RAID Rebuild: Once the replacement drive is installed, the RAID controller will start rebuilding the data on the new drive from the remaining drives in the array. During this process, data redundancy is restored.

  • Recovery and Verification: Allow the RAID to rebuild to complete, and after successful completion, verify that all data is accessible and that the RAID array has returned to its normal state.

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