Linux Disk Health Monitoring: SMART Data Analysis and Failure Prediction

Understanding Disk Health Monitoring

Hard drives and SSDs have finite lifespans. SMART (Self-Monitoring, Analysis, and Reporting Technology) provides early warning signs of impending drive failure, giving administrators time to backup data and replace failing hardware.

SMART Health Checks

sudo smartctl -H /dev/sda
sudo smartctl -A /dev/sda
sudo smartctl -t short /dev/sda

Key SMART Attributes to Monitor

• Reallocated Sector Count - Sectors remapped due to read errors
• Current Pending Sector Count - Unstable sectors awaiting reallocation
• Uncorrectable Error Count - Errors that could not be recovered
• Temperature - Operating temperature affects drive lifespan
• Power-On Hours - Total hours the drive has been powered on

Disk I/O Statistics

iostat -dx 1 5
iotop -o
cat /proc/diskstats

Inode Usage Monitoring

Running out of inodes is as critical as running out of disk space. Many small files can exhaust inodes while disk space appears available.

df -i
find / -xdev -printf "%h\n" | sort | uniq -c | sort -rn | head

Automated Monitoring with dargslan-disk-health

pip install dargslan-disk-health
dargslan-disk-health
dargslan-disk-health --smart
dargslan-disk-health --inodes