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Unable to Mount VeeamBackup_ Datastore - Specified Key, Name, or Identifier Already Exists

KB ID: 1690
Product: Veeam Backup & Replication | 9.5 | 10 | 11 | 12
Published: 2012-11-13
Last Modified: 2021-11-12
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Challenge


During a Veeam vPower NFS-based operation (SureBackup, Instant Recovery, Instant Disk Recovery, or Other-OS FLR), the following errors may occur: 
Unable to mount vPower NFS volume (<mountserver_ip>:/VeeamBackup_<mountserver>). Fault "AlreadyExistsFault",
Error The specified key, name, or identifier already exists.
Unable to create datastore VeeamBackup_<mountserver_ip> on host <esxi_host>, because it already exists
The Datastore that Veeam Backup & Replication will attempt to create will always start with the prefix 'VeeamBackup_' and the ending with the Mount Server's hostname, FQDN, or IP.

Cause

This error occurs when the vSphere Environment cannot create the 'VeeamBackup_' datastore because a datastore already exists with that name, or there is an entry stuck in the Datastore cache.

Solution

Initial Troubleshooting

Before proceeding to more advanced troubleshooting steps, determine if a datastore matching the name specified in the error is visible via a vSphere Client. If so, unmount it.

  • Using the vSphere Web Client, connect to the vCenter that manages the ESXi host specified in the error. Review the list of Datastores and unmount the one that matches the datastore name shown in the error.
  • Using the vSphere Web Client, connect directly to the ESXi host specified in the error. Review the list of Datastores the ESXi host lists, and unmount the one that matches the name shown in the error.

Advanced Troubleshooting

If the unmount process fails, or there is no datastore matching the name visible, you should consider restarting the management agents on the ESXi host listed in the error.

If the issue persists after restarting Management Agents, review KB4167 for details on removing latent entries from the ESXi host's Datastore cache.

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