LVM Filesystem Full Despite Available Free Space In VG

📖 ~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

Filesystem reaches 100% usage while volume group still reports free capacity.

Environment & Reproduction

Logical volume was never extended, or filesystem growth step was skipped.

Root Cause Analysis

Run lsblk, lvs, vgs, and df -h to map block and filesystem boundaries.

Quick Triage

Determine safe increment with headroom for snapshots and future allocations.

Step-by-Step Diagnosis

Run lvextend -L +20G /dev// or equivalent extents-based command.

Solution – Primary Fix

For XFS use xfs_growfs ; for ext4 use resize2fs on target LV.

Solution – Alternative Approaches

Confirm new capacity with df -h and ensure application paths have free space.

Verification & Acceptance Criteria

If mount changes occurred, verify contexts remain correct for services.

Rollback Plan

Adjust monitoring thresholds for both filesystem and VG free extents.

Prevention & Hardening

Writes fail, services crash, and dnf updates may stop due to low disk space.

Related Errors & Cross-Refs

Temporarily clean large logs with journalctl vacuum if immediate relief needed.

Related tutorial: View the step-by-step tutorial for rhel-9.

View all rhel-9 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Use capacity forecasting and auto-remediation runbooks for storage growth.