SMART Log Plotter

SMART Log Plotter is a local web app for exploring SMART attribute history from smartmontools logs. It parses timestamped attribute data and plots one selected attribute over time, with support for both raw and normalized values.

This is useful when you want to inspect disk health trends (for example, temperature, pending sectors, reallocated sectors, or power-on hours) without manual spreadsheet work.

SMART Attribute Reference

For a general description of SMART attributes and terminology, see:

• https://en.wikipedia.org/wiki/Self-Monitoring,_Analysis_and_Reporting_Technology

What It Does

• Parses log rows in this shape:
  • YYYY-MM-DD HH:mm:ss; attr; norm; raw; attr; norm; raw; ...
• Extracts attribute series by SMART ID.
• Lets you select one attribute from the detected list.
• Plots:
  • raw
  • normalized
  • both (dual Y-axes)
• Shows summary info:
  • number of parsed rows
  • number of discovered attributes
  • detected time range

Input Format

Expected input is semicolon-separated text where each row starts with a timestamp and then repeats SMART triplets.

Example:

2020-07-14 13:04:23; 1; 67; 5113173; 3; 96; 0; 5; 100; 0;

Parser behavior:

• Splits by ;
• Trims whitespace and tab characters
• Ignores empty trailing separators
• Skips unusable rows/values (invalid timestamp or non-numeric value)

Logs are usually found in /var/lib/smartmontools/ on Linux systems.

Screenshot

Tech Stack

• React + TypeScript
• Vite
• Recharts

Development

Install dependencies and start the dev server:

npm install
npm run dev

Build for production:

npm run build

Preview a production build locally:

npm run preview

Notes

• This project is client-side only (no backend).
• Timestamps are displayed using your local browser time formatting from parsed log data.

Online version

This repo includes a workflow at .github/workflows/deploy-pages.yml that deploys to https://giorginolab.github.io/smartmontools_log_plotter/ . Data is processed locally on your machine.