Troubleshooting Guide For NFSv4 File Lock & Hang Issues On Exalogic Linux Environments
(Doc ID 1492780.1)
Last updated on JUNE 04, 2021
Oracle Exalogic Elastic Cloud Software - Version 126.96.36.199.0 and later Linux x86-64
This document provides detailed steps about troubleshooting and debugging NFSv4 File lock and hang issues on Exalogic Linux environments both physical and virtual. The NFSv4 hang issues like ls, ps, df commands on a NFS share hanging & NFSv4 File lock issues like WebLogic processes, java processes or other application processes like Siebel, SOA etc not starting with errors like “unable to obtain file lock”.
The majority of these NFSv4 hang and File lock issues happen due to following reasons:
Recommended Configurations not in place such as IPMP settings & Delegation Settings on Storage Appliance.
Improper NIS/LDAP configuration
NTP configuration issues like NTP not synced across compute nodes/vServers and ZFS heads
Running older versions of Exalogic PSUs which have known issues.
One or more/all of the above
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