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Troubleshooting nfs41client failed to load in ESXi 6.7 - vInfrastructure Blog

nfs41client failed to load esxi 6 38: How to Troubleshoot and Fix This Problem

If you are using ESXi 6.5 or later, you might encounter a problem where the nfs41client fails to load during the boot process. This can cause various issues, such as not being able to mount or access an NFS datastore, losing network connectivity, or getting stuck at a loading screen. In this article, we will explain what nfs41client is, why it is used in ESXi, what causes it to fail, how to troubleshoot it, and how to fix it.

nfs41client failed to load esxi 6 38

What is nfs41client and why it is used in ESXi

nfs41client is a kernel module that provides support for NFS v4.1 protocol in ESXi. NFS (Network File System) is a file-sharing protocol that allows clients to access files stored on a remote server over a network. ESXi uses NFS to connect to NFS datastores, which are shared storage locations that can store virtual machine files, ISO images, templates, and other data.

NFS v4.1 is an improved version of NFS that offers several benefits over NFS v3, such as:

  • Better performance and scalability

  • Enhanced security features

  • Support for multipathing and load balancing

  • Support for file locking and delegation

  • Support for session trunking and migration

nfs41client is loaded automatically when an ESXi host mounts an NFS v4.1 datastore. It communicates with the NFS server using TCP port 2049 by default. It also opens a firewall rule set called nfs41client that allows outgoing traffic to any IP address on port 2049.

What is the problem of nfs41client failing to load

Sometimes, when an ESXi host boots up, it might fail to load the nfs41client module. This can happen due to various reasons, such as incompatible hardware or drivers, misconfigured network or storage settings, corrupted files or drivers, or other unknown factors. When this happens, you might see an error message like "nfs41client failed to load" or "nfs41client loaded successfully" but nothing happens after that.

This problem can have serious consequences for your ESXi host and its virtual machines. Depending on the situation, you might experience one or more of these symptoms:

  • The ESXi host cannot mount or access an NFS datastore

  • The ESXi host loses network connectivity or gets stuck at a loading screen

  • The virtual machines on the ESXi host cannot start or operate normally

  • The ESXi host cannot be managed or updated

  • The ESXi host cannot be upgraded to a newer version

Therefore, it is important to troubleshoot and fix this problem as soon as possible.

How to troubleshoot nfs41client failing to load dcd2dc6462


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