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82 lines
2.4 KiB
Markdown
82 lines
2.4 KiB
Markdown
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# SMART Drive Monitoring
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SMART (Self-Monitoring, Analysis and Reporting Technology) provides early warning of drive
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failures. The Controller monitors SMART data for all connected drives.
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## Drive Health Assessment
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Each drive displays an overall health assessment:
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| Status | Meaning |
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|----------|----------------------------------------------|
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| **PASS** | Drive is healthy, no issues detected |
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| **WARN** | Potential issues detected, monitor closely |
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| **FAIL** | Drive is failing or has failed, replace soon |
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_Image taken from a WROLPi with two external USB disks_
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## Monitored Attributes
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### Temperature
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Current drive temperature in Celsius. High temperatures can indicate:
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- Poor ventilation
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- Heavy workload
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- Impending failure
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Most drives operate safely below 50°C. Temperatures above 60°C may reduce drive lifespan.
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### Power-On Hours
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Total hours the drive has been powered on. This helps estimate drive age and remaining lifespan.
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Most drives are rated for 3-5 years of continuous operation (26,000-44,000 hours).
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### Reallocated Sector Count
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Number of bad sectors that have been remapped to spare sectors. A small number is normal over
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time, but rapid increases indicate drive degradation.
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### Pending Sector Count
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Sectors waiting to be remapped. These are sectors that had read errors but haven't been
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reallocated yet. Non-zero values warrant monitoring.
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## Viewing Detailed SMART Data
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Click on a drive's SMART status to view the full SMART attributes table. This includes:
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- All SMART attribute values
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- Threshold values
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- Raw values
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- Worst recorded values
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## Drives Without SMART
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Some drives don't support SMART monitoring:
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- USB flash drives
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- SD cards
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- Some external enclosures that don't pass SMART data
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- Virtual disks
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These drives will show "SMART not available" in the status.
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## Recommendations
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- **Check SMART status regularly** - Weekly checks can catch problems early
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- **Replace WARN drives soon** - Don't wait for failure
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- **Backup immediately on FAIL** - Data loss may be imminent
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- **Monitor temperature** - Ensure adequate cooling
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## Docker Mode
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SMART monitoring requires direct hardware access and is not available in Docker deployments.
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Monitor drive health from the host system instead.
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