NMM: Hyper-V Cluster Backup Failure. Failed to gather VM details. Item has already been added.

Summary: NetWorker Module for Microsoft (NMM) Hyper-V Cluster Backup Failure.

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Symptoms

Backups of a Hyper-V cluster performed through the NetWorker Microsoft Module (NMM) fail.
The Backup fails with the following error in the Backup log: 
Failed to gather VM details \n
Item has already been added. Key in dictionary: '339049E0-7012-4DCB-B34B-35B46AC4457E' Key being added: '339049E0-7012-4DCB-B34B-35B46AC4457E'

Cause

There is a 'Duplicate VM' in the Hyper-V Cluster that is clustered, and it exists in multiple clustered roles, with the same VM ID.

Resolution

1. Run the following PowerShell command to find the VM IDs, that exists in multiple roles simultaneously;  
Get-ChildItem 'hklm:\cluster\Resources' | ?{ ($_ |  Get-ItemProperty -Name Type).Type  -eq 'Virtual Machine' } | %{ ( $_ | gci | Get-ItemProperty -Name VmId).vmid} | Group-Object | ? Count -gt 1

2. Look in the Windows Registry (HKLM:\cluster\Resources) for the IDs to find problem roles.

3. Have the 'Hyper-V Administrator' check/verify this in the 'Widows Failover Cluster Manager' to resolve the Duplicate VM.

Affected Products

NetWorker Module for Microsoft
Article Properties
Article Number: 000191761
Article Type: Solution
Last Modified: 08 Oct 2024
Version:  3
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