🔴 Critical   ⏱ 5–30 min  Last verified: 20 May 2026
Affected versions: IBM AIX 7.3

📖 ~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

Reboot after TL update yields 0c31/0c32 LED and won’t boot.

Environment & Reproduction

bosboot was not re-run or bootlist points to wrong disk.

Root Cause Analysis

Boot image on hdisk is stale or missing after fileset change.

Quick Triage

From SMS, boot to maintenance and run ipl_varyon -i.

Step-by-Step Diagnosis

Inspect lslv -m hd5 and bootlist -m normal -o.

Illustrative mockup for aix-7.3 — rootvg_bosboot_failure_a_diag
Diagnostic view for rootvg-bosboot-failure-after-update — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Run bosboot -ad /dev/hdiskN then bootlist -m normal hdiskN.

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Illustrative mockup for aix-7.3 — rootvg_bosboot_failure_a_fix
Remediation steps for rootvg-bosboot-failure-after-update — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Boot from mksysb DVD/NIM to repair if hd5 corrupted.

Verification & Acceptance Criteria

System reboots to multi-user without LED stalls.

Rollback Plan

Restore mksysb if bosboot can’t write a valid image.

Prevention & Hardening

Always run bosboot after kernel/TL changes via NIM script.

Pairs with mirrored rootvg failed copy on hd5.

Related tutorial: View the step-by-step tutorial for aix-7.3.

View all aix-7.3 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

IBM Docs: bosboot, bootlist.

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