Dell Technologies Boot Optimized Storage Solution-S2 User's Guide

SMART monitors certain physical aspects of the disk electronics to help detect predictable disk failures. Data on SMART-compliant physical disks can be monitored to identify changes in values and determine whether the values are within the threshold limits. Any electrical failures in the disk can cause degradation in the performance before failure.

A SMART failure is also referred to as a predicted failure. There are numerous factors that predict physical disk failures, such as a read error rate, throughput performance, and changes in spin-up time. In addition, there are factors related to read/write surface failure, such as seek error rate and excessive bad blocks.