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Troubleshooting Guide For NFSv4 File Lock & Hang Issues On Exalogic Linux Environments (Doc ID 1492780.1)

Last updated on JUNE 04, 2021

Applies to:

Oracle Exalogic Elastic Cloud Software - Version 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:

Troubleshooting Steps

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In this Document
Troubleshooting Steps
 Requirements For NFSv4 stability
 Steps For Debugging NFSv4 File Lock Issues
 User/Group & Permissions Validation
 NIS Services Validation
 NTP service & synchronization validation
 nobody:nobody Known Issue Validation
 NIS Services Testing
 Validate Unused LockStateID Entries In ZFS Storage Appliance
 NFSv4 File Lock Diagnostic Data collection
 Steps For Debugging NFSv4 Hang Issues
 Validate IPMP Settings On ZFSSA
 Validate If NFSv4 Delegation Is Disabled on ZFSSA
 Validate Network Status On ZFSSA
 Validate NFS Service Status On ZFSSA
 Validate if NFSv4 mount options
 Unmount and Remount the NFSv4 shares
 NFSv4 Hang Diagnostic Data collection

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