Ubuntu 14.04 LTS Inode Exhaustion Despite Free Disk Space

📖 ~1 min read

Table of contents

1. Symptom & Impact
2. Environment & Reproduction
3. Root Cause Analysis
4. Quick Triage
5. Step-by-Step Diagnosis
6. Solution – Primary Fix
7. Solution – Alternative Approaches
8. Verification & Acceptance Criteria
9. Rollback Plan
10. Prevention & Hardening
11. Related Errors & Cross-Refs
12. References & Further Reading

Symptom & Impact

Applications report no space left on device while df shows available disk bytes.

Environment & Reproduction

Typical on mail spools, cache directories, or temporary paths with many tiny files.

Root Cause Analysis

Filesystem inode table is exhausted before physical storage blocks are consumed.

Quick Triage

Run df -i and quickly identify directories with extreme file-count growth.

Step-by-Step Diagnosis

Use find and sort pipelines to detect inode hotspots and orphaned temporary artifacts.

Solution – Primary Fix

Remove obsolete tiny files in bulk and tune application retention behavior.

Solution – Alternative Approaches

Reformat with higher inode density or migrate to filesystem better suited for small files.

Verification & Acceptance Criteria

Inode usage drops to safe threshold and file creation succeeds across services.

Rollback Plan

Restore purged files from archive if deleted data is required for compliance.

Prevention & Hardening

Set inode monitoring alerts and periodic cleanup jobs for high-churn directories.

Related Errors & Cross-Refs

Frequently paired with /var full incidents and package manager temp file failures.

Related tutorial: View the step-by-step tutorial for Ubuntu 14.04 LTS.

View all Ubuntu 14.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

ext filesystem inode design docs and Linux capacity planning references.