CompTIA Server+ (SK0-005)TroubleshootingMedium
A technician is performing routine maintenance on a server that hosts several virtual machines. During the process, the technician notices that the server's hardware RAID controller's management interface reports a 'Predictive Failure' warning for one of the drives in a RAID 10 array. All virtual machines are currently operating without issue. What is the MOST appropriate NEXT step for the technician?
- AReplace the flagged drive as soon as possible.
- BImmediately shut down the server to prevent data loss.
- CRebuild the entire RAID 10 array from backup.
- DRun a full diagnostic test on all drives in the array.
Show answer & explanationAnswer & explanation
Correct answer: A. Replace the flagged drive as soon as possible.
A 'Predictive Failure' warning indicates that the drive's SMART data suggests an impending failure. While the drive is still operational, it is critical to replace it proactively to prevent actual failure, which could degrade the RAID 10 array and potentially lead to downtime or data loss if another drive fails before replacement.
Why the other options are wrong
- B. Shutting down immediately is unnecessary as the drive is still functional and the array is not degraded yet; it would cause unnecessary downtime.
- C. Rebuilding the entire array is a drastic step and would cause significant downtime and is not necessary for a single drive with a predictive failure warning.
- D. While diagnostics can confirm the issue, the 'predictive failure' warning itself is a strong enough indicator to warrant replacement without further delay, especially if the server is in production.
Predictive Drive Failure
A warning from a drive's Self-Monitoring, Analysis, and Reporting Technology (SMART) data indicating an impending hardware failure, allowing for proactive replacement.
- Indicates a drive is likely to fail soon.
- Allows for proactive replacement without downtime.
- SMART data provides early warning signs.
Memory trick: Predictive failure means act fast, replace the drive before it's past.