Which are common signs that a disk has failed in a NetApp system?

• A. Replacing a failed or degraded disk; abnormal LED indicators; SMART errors
• B. Increasing cache hit ratio
• C. High throughput with low latency
• D. Excessive free space on volume

Answer: (A)

Disk health in a NetApp system is signaled by concrete indicators of a drive’s problem. When a disk is failing, the system will typically mark it as failed or degraded, the disk bay LED will often show an abnormal color (such as amber or red), and SMART data from the drive will log errors or attribute threshold crossings. Collectively, these signals point to a hardware issue that requires replacing the disk or rebuilding onto a spare, ensuring continued data protection and availability.

By contrast, the other options describe performance characteristics, not failure indicators. A rising cache hit ratio, high throughput with low latency, or having a lot of free space on a volume reflect performance or capacity status, not that a specific disk has failed.