IBM AIX 7.3 – Common Problem 031 – 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

On IBM AIX 7.3, mksysb to tape fails with I/O error on rmt0 surfaces in errpt and user-facing services, risking outage and SLA breach until the mksysb path is corrected.

Environment & Reproduction

Reproduce on IBM AIX 7.3 LPARs by exercising the mksysb workflow that triggers mksysb to tape, then capture errpt -a, oslevel -s, and lssrc -a output with timestamps.

Root Cause Analysis

Root cause for mksysb to tape is typically ODM drift, LVM metadata mismatch, fileset state, or subsystem misconfiguration exposed by mksysb on IBM AIX 7.3.

Quick Triage

Run errpt | head, lssrc -a, lsvg -o, svmon -G, and df -g to confirm mksysb to tape scope before mutating ODM or LVM on the IBM AIX 7.3 host.

Step-by-Step Diagnosis

Drill into mksysb to tape with errpt -aj , lslpp -L, mksysb-specific queries, and smit fast paths; record evidence in a IBM AIX 7.3 change ticket before remediation.

Solution – Primary Fix

Apply the least-invasive mksysb/smit remediation for mksysb to tape, refresh -s the affected subsystem, then re-run errpt and lssrc on IBM AIX 7.3 to confirm clean state.

Solution – Alternative Approaches

If the primary fix is blocked, fall back to ODM rebuild, varyoff/varyonvg, mksysb restore of the affected filesets, or LPAR reboot during a IBM AIX 7.3 maintenance window.

Verification & Acceptance Criteria

Accept when errpt is clean, lssrc shows active, lslpp -L reports COMMITTED, application probes pass, and mksysb to tape does not recur for one full IBM AIX 7.3 business cycle.

Rollback Plan

Keep a current mksysb plus alt_disk_copy snapshot; save ODM (/etc/objrepos) and modified config files so any mksysb to tape remediation on IBM AIX 7.3 can be reversed within minutes.

Prevention & Hardening

Schedule errpt monitoring, lssrc/lslpp drift checks, paging/svmon thresholds, and quarterly mksysb tests so mksysb to tape cannot silently re-emerge on IBM AIX 7.3.

Related Errors & Cross-Refs

Cross-reference related errpt labels, IBM APARs, and adjacent mksysb/LVM/subsystem issues to short-circuit triage on future mksysb to tape incidents.

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

See IBM Documentation for IBM AIX 7.3, IBM Support APAR notes, AIX Toolbox guides, and internal IBM AIX 7.3 runbooks for deeper remediation detail on mksysb to tape.