Introduction RAID (Redundant Array of Independent Disks) is designed to improve storage reliability, performance, and redundancy. However, disk failures, data corruption, and array degradation can still occur. This guide provides an introductory approach to diagnosing and resolving RAID disk issues effectively. Common RAID Issues and Symptoms 1. Degraded RAID Array If your RAID is operational but running in degraded mode due to a failed disk, then you can check the following cat /proc/mdstat sudo mdadm --detail /dev/md0 Here you can identify the failed disk and replace it with a new one. 2. Failed RAID Rebuild If the RAID rebuild fails to complete, or the array remains degraded, then you can check the mdraid details sudo mdadm --detail /dev/md0 Go for the logs to check something is logged related to mdraid or disk failure. You can also consult to dmesg command. sudo dmesg | grep md Verify disk health using SMART diagnostics and retry the rebuild. 3. RAID Not Detecting a New...
Yet another blog about Storage and Linux systems