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wrolpi-help/docs/controller/smart.md

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SMART Drive Monitoring

SMART (Self-Monitoring, Analysis and Reporting Technology) provides early warning of drive failures. The Controller monitors SMART data for all connected drives.

Drive Health Assessment

Each drive displays an overall health assessment:

Status Meaning
PASS Drive is healthy, no issues detected
WARN Potential issues detected, monitor closely
FAIL Drive is failing or has failed, replace soon

Image taken from a WROLPi with two external USB disks

SMART health assessment

Monitored Attributes

Temperature

Current drive temperature in Celsius. High temperatures can indicate:

  • Poor ventilation
  • Heavy workload
  • Impending failure

Most drives operate safely below 50°C. Temperatures above 60°C may reduce drive lifespan.

Power-On Hours

Total hours the drive has been powered on. This helps estimate drive age and remaining lifespan. Most drives are rated for 3-5 years of continuous operation (26,000-44,000 hours).

Reallocated Sector Count

Number of bad sectors that have been remapped to spare sectors. A small number is normal over time, but rapid increases indicate drive degradation.

Pending Sector Count

Sectors waiting to be remapped. These are sectors that had read errors but haven't been reallocated yet. Non-zero values warrant monitoring.

Viewing Detailed SMART Data

Click on a drive's SMART status to view the full SMART attributes table. This includes:

  • All SMART attribute values
  • Threshold values
  • Raw values
  • Worst recorded values

SMART detailed attributes

Drives Without SMART

Some drives don't support SMART monitoring:

  • USB flash drives
  • SD cards
  • Some external enclosures that don't pass SMART data
  • Virtual disks

These drives will show "SMART not available" in the status.

Recommendations

  • Check SMART status regularly - Weekly checks can catch problems early
  • Replace WARN drives soon - Don't wait for failure
  • Backup immediately on FAIL - Data loss may be imminent
  • Monitor temperature - Ensure adequate cooling

Docker Mode

SMART monitoring requires direct hardware access and is not available in Docker deployments. Monitor drive health from the host system instead.

SMART not available in Docker mode