IBM AIX 7.2 – Common Problem 206 – 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 fail to create files with ENOSPC even though df shows free space.

Environment & Reproduction

Filesystem holds many small files and was created with default NBPI.

df -g /work
df -v /work
ls /work | wc -l

Root Cause Analysis

JFS2 has exhausted inode allocation because NBPI was set too high at creation.

Quick Triage

Confirm inode shortage rather than block shortage.

df -v /work
lsfs /work
istat /work

Step-by-Step Diagnosis

Compare used inodes to free inodes and check filesystem parameters.

df -v /work
lsjfs2 -q /work
find /work -xdev -type f | wc -l

Solution – Primary Fix

Extend the filesystem; JFS2 dynamically allocates more inodes on growth.

chfs -a size=+2G /work
df -v /work
fsck -y /dev/fslv00

Solution – Alternative Approaches

Recreate the filesystem with a lower NBPI value and restore data from backup.

Verification & Acceptance Criteria

df -v shows additional free inodes and writes succeed.

df -v /work
touch /work/test
rm /work/test

Rollback Plan

Shrink filesystem only if PPs must be returned; data stays in place.

lsfs /work
chfs -a size=-1G /work
df -v /work

Prevention & Hardening

Tune NBPI per workload and monitor df -v inode utilization.

Related Errors & Cross-Refs

Related to mail/spool errors, log rotation failures, and tar restore errors.

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 JFS2 filesystem reference.