What if a hard disk in raid6 becomes ubad?

1. First, before processing, all data in the raid array must be backed up to prevent data loss during processing.

2. Then replace the failed hard disk, remove the failed hard disk from the raid array and replace it with a new healthy hard disk.

3. Secondly, rebuild the raid array, using raid controller or software tools to rebuild the raid array, including the new hard disk and all backup data. The reconstruction process will automatically fix the problems caused by ubad hard disk and regenerate raid parity information.

4. Finally, verify the repair results. After rebuilding, verify whether the raid array can work normally and ensure that all data has been successfully restored.