IBM AIX 7.3 – Common Problem 043 – 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, no -o tcp_sendspace tunable change does not persist surfaces in errpt and user-facing services, risking outage and SLA breach until the smit path is corrected.

Environment & Reproduction

Reproduce on IBM AIX 7.3 LPARs by exercising the smit workflow that triggers no -o tcp_sendspace, then capture errpt -a, oslevel -s, and lssrc -a output with timestamps.

Root Cause Analysis

Root cause for no -o tcp_sendspace is typically ODM drift, LVM metadata mismatch, fileset state, or subsystem misconfiguration exposed by smit on IBM AIX 7.3.

Quick Triage

Run errpt | head, lssrc -a, lsvg -o, svmon -G, and df -g to confirm no -o tcp_sendspace scope before mutating ODM or LVM on the IBM AIX 7.3 host.

Step-by-Step Diagnosis

Drill into no -o tcp_sendspace with errpt -aj , lslpp -L, smit-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 smit/smit remediation for no -o tcp_sendspace, 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 no -o tcp_sendspace 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 no -o tcp_sendspace 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 no -o tcp_sendspace cannot silently re-emerge on IBM AIX 7.3.

Related Errors & Cross-Refs

Cross-reference related errpt labels, IBM APARs, and adjacent smit/LVM/subsystem issues to short-circuit triage on future no -o tcp_sendspace 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 no -o tcp_sendspace.