IBM AIX 7.1 – Common Problem 186 – 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

IBM AIX 7.2: alt_disk_install clone fails to set bootlist correctly can interrupt LPAR workloads and risks SLA breach if AIX admins do not act on the alt_disk bootlist signal quickly.

Environment & Reproduction

Reproduce on IBM AIX 7.2 LPARs by triggering the alt_disk bootlist path; capture errpt entries, alog output, and exact timestamps for evidence.

Root Cause Analysis

Primary cause is typically ODM drift, device or filesystem state, or a stale runtime resource tied to alt_disk bootlist on AIX 7.2.

Quick Triage

Run safe checks first: errpt -a, lssrc -a, lsps -a, df -g, and topas snapshot before changing any alt_disk bootlist configuration.

Step-by-Step Diagnosis

Use AIX command-line tools (lsdev, lscfg, lsattr, lsvg, errpt, snap) to confirm the alt_disk bootlist root cause and document state.

Solution – Primary Fix

Apply the least-disruptive alt_disk bootlist remediation using cfgmgr, chdev, smitty, or installp; reload services and confirm errpt is clean.

Solution – Alternative Approaches

If the primary alt_disk bootlist fix is blocked, use alt_disk_install, multibos, or NIM-based rollback paths with documented trade-offs.

Verification & Acceptance Criteria

Acceptance requires clean errpt, healthy lssrc subsystems, restored alt_disk bootlist functionality, and no repeat predictive errors.

Rollback Plan

Keep an AIX rollback path ready: mksysb image, alt_disk_install clone, bosboot validation, and ordered subsystem restart for alt_disk bootlist.

Prevention & Hardening

Prevent alt_disk bootlist recurrence with TL/SP hygiene, NIM-driven patching, monitoring thresholds in nmon/topas, and runbooks.

Related Errors & Cross-Refs

Track related alt_disk bootlist signatures in errpt and PowerHA logs to speed triage of future AIX 7.2 incidents.

Related tutorial: View the step-by-step tutorial for aix-7.1.

View all aix-7.1 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Use IBM AIX 7.2 documentation, IBM Support flashes, and internal postmortems for deeper alt_disk bootlist remediation guidance.