IBM AIX 7.2 – Common Problem 211 – 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

NFS mounts on AIX clients report stale file handle and operations hang.

Environment & Reproduction

After NFS server reboot, export change, or fsid renumbering.

mount | grep nfs
showmount -e srv
nfsstat -c

Root Cause Analysis

Client file handle no longer matches the exported filesystem identity on the server.

Quick Triage

Confirm the stale mount and server export status.

mount
showmount -e srv
ls /mnt/nfs

Step-by-Step Diagnosis

Use nfsstat and rpcinfo to inspect client/server state.

nfsstat -c
rpcinfo -p srv
errpt | head

Solution – Primary Fix

Unmount forcibly, remount, and verify with a directory listing.

umount -f /mnt/nfs
mount srv:/export /mnt/nfs
ls /mnt/nfs

Solution – Alternative Approaches

Use NFSv4 with stable fsids or auto-mount with retry to absorb server changes.

Verification & Acceptance Criteria

Mount is responsive and applications can read and write files.

mount
ls /mnt/nfs
nfsstat -c

Rollback Plan

Unmount and switch back to the previous server export if the new mount misbehaves.

umount /mnt/nfs
mount oldsrv:/export /mnt/nfs
ls /mnt/nfs

Prevention & Hardening

Pin NFS fsids, use NFSv4, and monitor with nfsstat and errpt.

Related Errors & Cross-Refs

Related to RPC timeouts, automount errors, and home directory failures.

Related tutorial: View the step-by-step tutorial for aix-7.2.

View all aix-7.2 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

IBM AIX 7.2 NFS administration guide.