A server is configured with a hardware RAID controller and multiple SAS drives. The server administrator notices that the RAID controller's status LED is blinking amber, and the controller's management utility reports a 'predicted drive failure' for one of the drives. The array is still operating in a healthy, redundant state. What action should the administrator take FIRST?
- AShut down the server immediately to prevent further damage.
- BRun a comprehensive diagnostic test on the entire RAID array.
- CPerform a full backup of all data on the server.
- DReplace the predicted failing drive as soon as possible.
Show answer & explanationAnswer & explanation
Correct answer: C. Perform a full backup of all data on the server.
While 'predicted drive failure' indicates an imminent issue and the drive should be replaced, the MOST critical FIRST step is to ensure data integrity. A full backup protects against a cascade failure (e.g., a second drive fails during the replacement/rebuild process, or the predicted drive fails completely before the replacement is done) while the array is already at risk. Only after a backup is secured should the drive replacement proceed.
Why the other options are wrong
- A. Shutting down is not necessary as the array is still redundant, and replacing a hot-swappable drive while running is preferred to minimize downtime.
- B. Running diagnostics on the entire array is less critical than securing data, and might put additional stress on the already-failing drive.
- D. Replacing the drive is the next logical step, but backing up data first is paramount to mitigate risk during the replacement process.
Predicted Drive Failure
A warning from a RAID controller or drive monitoring system (like S.M.A.R.T.) indicating that a drive is likely to fail in the near future, based on detected errors or degrading performance metrics.
- The drive has not yet failed, and the array may still be redundant.
- Indicates a high risk of imminent failure.
- Requires proactive replacement and data protection measures.
Memory trick: Drive's warning, array's still fine? Backup first, then draw the line!