IBM AIX 7.1 – Common Problem 078 – 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

Applications report ESTALE on NFSv4 mounts after server reboot.

Environment & Reproduction

Common with grace period misalignment or exported FS recreation.

Root Cause Analysis

Client cached file handle no longer maps to a server inode.

Quick Triage

Run nfsstat -m on the client and showmount -e on the server.

Step-by-Step Diagnosis

Inspect /var/adm/ras/nfslog and clientstat -v output for grace errors.

Solution – Primary Fix

Unmount and remount the share: umount /mnt; mount /mnt.

Solution – Alternative Approaches

Alternative: restart nfsrgyd and bounce nfsd via stopsrc/startsrc -g nfs.

Verification & Acceptance Criteria

Verify access with ls and stat against known good files post-remount.

Rollback Plan

Document mount options (vers=4,proto=tcp) for quick re-creation.

Prevention & Hardening

Set nfso -p -o nfs_v4_fail_over_timeout to tune client recovery.

Related Errors & Cross-Refs

Related: rpc.statd, rpc.lockd or nfsrgyd subsystem failures.

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

IBM Docs: NFSv4 troubleshooting and nfs4cl administration.