IBM AIX 7.1 – Common Problem 004 – 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

Device commands fail with ODM database errors and odmget returns truncated output.

Environment & Reproduction

IBM AIX 7.2 LPAR exhibiting ODM corruption issues under standard PowerVM workloads.

odmget CuDv | head
lsdev -C | head

Root Cause Analysis

Concurrent device changes or unclean shutdown corrupt /etc/objrepos files.

Quick Triage

Confirm scope with errpt, recent changes, and subsystem state via lssrc.

errpt | grep -i odm
ls -l /etc/objrepos

Step-by-Step Diagnosis

Validate ODM class integrity and back up before repair.

odmget -q name=hdisk0 CuDv
odmshow CuDv

Solution – Primary Fix

Restore ODM classes from mksysb backup and rebuild device tree.

savebase
cfgmgr -v

Solution – Alternative Approaches

Use alt_disk_copy boot image to restore /etc/objrepos directly.

Verification & Acceptance Criteria

Confirm subsystem returns to RUNNING state and errpt shows no new entries.

lsdev -C
odmget CuDv | wc -l

Rollback Plan

Restore prior configuration from mksysb or alt_disk_install clone if the fix regresses.

cp /etc/objrepos.bak/* /etc/objrepos/

Prevention & Hardening

Encode the fix in NIM customisation scripts and monitor via topas/nmon.

savebase  # after every device change

Related Errors & Cross-Refs

errpt LABEL=ODMUPDATE; cfgmgr loops

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

AIX Object Data Manager reference