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Known Critical Issues for NFSv4 on Oracle Linux and related products (Doc ID 2171587.1)

Last updated on SEPTEMBER 21, 2023

Applies to:

Oracle Exalogic Elastic Cloud Software
Oracle VM - Version 3.0.1 and later
Linux OS - Version Oracle Linux 5.0 and later
Oracle Exadata Storage Server Software
Private Cloud Appliance
Linux x86-64
Linux x86
(Linux NFSv4 Client)


The Linux NFSv4 client has encountered several issues which have been frequently reported to Oracle Linux Support.

Specific configurations or kernel software versions experience hangs (sometimes crashes) when using NFSv4, but are stable under NFSv3. This document describes what environments are at risk of these issues, and how to mitigate them.


Specific affected environments include:

This document also describes best practices to avoid minor issues on:


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In this Document
 Linux NFSv4 client background and general recommendations
 Red Hat Compatible Kernel for Oracle Linux 5
 Unbreakable Enterprise Kernel Release 1
 Unbreakable Enterprise Kernel Release 2
 Unbreakable Enterprise Kernel Release 3
 Unbreakable Enterprise Kernel Releases 4 and 5 (and later)
 Statement of support for NFSv4 on UEK2 and UEK3
 Mitigation of NFSv4 issues on UEK2 and recommended settings
 Known issues for NFSv4 on UEK3

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