IBM AIX 7.3 – Common Problem 75 – 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

HMC shows LPAR RMC connection ‘Inactive’; DLPAR ops on AIX 7.3 fail.

Environment & Reproduction

RSCT rmcd on AIX cannot reach HMC over service network.

Root Cause Analysis

ctcas/IPSec keys out of sync or firewall blocking TCP/657.

Quick Triage

Run lssrc -a | grep rsct and rmcctrl -p to check state.

Step-by-Step Diagnosis

Use ctsnap -d /tmp/ctsnap to package RSCT diagnostics.

Solution – Primary Fix

Re-cycle RSCT with rmcctrl -z; rmcctrl -A; rmcctrl -p.

Solution – Alternative Approaches

Recreate keys with ctcasd -a and re-add LPAR partition on HMC.

Verification & Acceptance Criteria

HMC shows RMC Active and lsdr -c mem returns expected values.

Rollback Plan

Restore /var/ct from snapshot if rmcctrl reset breaks DLPAR.

Prevention & Hardening

Allow TCP/657 to HMC and monitor RMC heartbeats.

Related Errors & Cross-Refs

DLPAR failures, missing partition profile updates.

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 RSCT and HMC RMC communication guide.