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NFS share cannot be used

KB ID: 4167
Product: Veeam Backup & Replication
Published: 2021-05-19
Last Modified: 2021-11-12
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Challenge

While performing a Guest Files restore for "Linux and other..." the restore operation fails with the following error: 
Failed to mount restore point.
Linux FLR appliance deploy failed
Failed to connect backup datastore to the ESX(i) host

Failed to add NFS datastore for NFS host, Failed to mount NFS volume
kb4167
Error as seen in Veeam Backup & Replication
At the time of the Guest File restore operation failing the following error is seen in VMware:
kb4167
Related error shown in VMware

Cause

During a previous Guest Files restore an NFS Datastore named VeeamBackup_<mount.server.name> was mounted to the ESXi host. If that ESXi host then had an unexpected reboot the previously mounted share becomes unavailable after reboot. When the next Guest Files restore begins the Veeam software detects that the NFS Datastore needs to be remounted and attempts to send requests for a new datastore to be created. This operation fails because the ESXi host kept the share name in the cache and does not allow the mounting of a share with the same name.

A reboot does not clear the cache, so restarting ESXi does not fix the issue.

Solution

The following steps are documented by VMware here: https://kb.vmware.com/s/article/1005057

Connect to ESXi by using SSH and run the following commands.

1. Use this command to list all mounted NFS datastores on the host:

esxcli storage nfs list
2. From the list of mounted NFS datastores, identify the VeeamBackup_<mount.server.name> one and use this command to remove it from the cache: 
esxcli storage nfs remove -v VeeamBackup_XYZ
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