Inode Exhaustion Causes No Space Left on Device Errors on Ubuntu 14.04

📖 ~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 even with free disk blocks, preventing file creation and disrupting normal operation.

Environment & Reproduction

Appears on Ubuntu 14.04 systems storing massive counts of tiny files in cache, spool, or temporary directories.

Root Cause Analysis

Filesystem inode table is exhausted before byte capacity, so new files cannot be allocated despite available block space.

Quick Triage

Check df -i output for inode exhaustion, find high file-count directories, and map ownership to responsible services.

Step-by-Step Diagnosis

Use find and wc counting to locate inode-heavy paths, evaluate cleanup safety, and identify recurring generators of tiny files.

Solution – Primary Fix

Remove or archive unnecessary small files, clear temporary cache trees, and restart services that were failing to create files.

Solution – Alternative Approaches

Reformat with higher inode density for expected workload, move small-object storage to database/object store, or partition by data type.

Verification & Acceptance Criteria

df -i shows recovered inode headroom, file creation works normally, and prior application write errors stop appearing.

Rollback Plan

Restore any mistakenly removed operational files from backups and reapply conservative cleanup with narrower scope.

Prevention & Hardening

Track inode utilization metrics, enforce data lifecycle policies, and cap unbounded cache directories through configuration limits.

Related Errors & Cross-Refs

Often confused with block exhaustion and can co-occur with /var disk pressure affecting apt, logs, and spool-based daemons.

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

Consult ext filesystem tuning guides, inode monitoring practices, and application-specific cache management recommendations.