IBM AIX 7.2 – Common Problem 052 – Diagnosis and Fix

📖 ~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

rootvg goes read-only or system hangs after a SAN path failure.

Environment & Reproduction

Single-copy LVs on multi-disk rootvg without mirroring.

Root Cause Analysis

Quorum lost when >50% of VGDA copies become unreachable.

Quick Triage

Check lsvg rootvg for QUORUM and PV STATE missing.

Step-by-Step Diagnosis

Use lsvg -p rootvg and lspv to confirm which hdisks dropped.

Solution – Primary Fix

varyonvg -f rootvg after restoring paths, then mirrorvg rootvg.

Solution – Alternative Approaches

Disable quorum with chvg -Qn rootvg as temporary workaround.

Verification & Acceptance Criteria

lsvg rootvg shows all PVs active and QUORUM ON.

Rollback Plan

Boot from alternate disk created with alt_disk_copy if rootvg unrecoverable.

Prevention & Hardening

Always mirror rootvg across two hdisks and validate with bosboot.

Related Errors & Cross-Refs

LVM_SA_QUORCLOSE, LVM_GS_RLEAVE, missing PV in lspv.

Related tutorial: View the step-by-step tutorial for aix-7.2.

View all aix-7.2 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

IBM Redbook on AIX LVM mirroring and quorum.