From experience, we have found the following 5 SMART metrics indicate impending disk drive failure:
- SMART 5 – Reallocated_Sector_Count.
- SMART 187 – Reported_Uncorrectable_Errors.
- SMART 188 – Command_Timeout.
- SMART 197 – Current_Pending_Sector_Count.
- SMART 198 – Offline_Uncorrectable.
We chose these 5 stats based on our experience and input from others in the industry because they are consistent across manufacturers and they are good predictors of failure.