What is a SMART-enabled proactive replacement?

• A. Replacement after catastrophic failure
• B. Replacement before catastrophic failure based on SMART trends.
• C. Replacement on a fixed calendar schedule
• D. Replacement when the drive fails

Answer: (B)

SMART data gives ongoing health indicators for a drive, and when you use those indicators to guide maintenance, you’re doing predictive, proactive replacement. The idea is to watch SMART attributes over time and notice trends that signal a higher risk of imminent failure. If an attribute is trending upward—such as more reallocated sectors, more pending sectors, rising read/write errors, longer spin-up times, or unusual temperature changes—you replace the drive before it actually fails. This reduces the chance of data loss and downtime, which is crucial in a data-center environment.

This is why the statement describing replacement before catastrophic failure based on SMART trends is the best one. It captures using data-driven health trends to act early rather than waiting for a failure to occur.

The other scenarios describe reacting after things go wrong or following a fixed schedule, which SMART-enabled proactive replacement specifically avoids. Replacing after a catastrophic failure means no head start to protect data; replacing on a calendar schedule ignores actual drive health; and replacing only when the drive fails is purely reactive.