Avamar: Hyper-V backups failing with "Unable to get the VMs for backup."

Summary: This knowledge base article provides information about Hyper-V backups that fail because the sharedstoragepath parameter is not configured.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
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Symptoms

Hyper-V cluster backups fail with errors similar to the following below:
  
avhypervvss Error <43381>: Unable to get the VMs for backup.
avhypervvss Info <0000>: --------------------Start [EMC Avamar Plug-in Service for Windows] log ------------------

avhypervvss Info <0000>: Calling Thread identity: NT AUTHORITY\SYSTEM

avhypervvss Info <0000>: SharedStoragePath is not set

avhypervvss Info <0000>: Exception in GetTargetVMsForRCT Failed to validate shared storage path

avhypervvss Info <0000>: ----------------------End [EMC Avamar Plug-in Service for Windows] log -------------------

avhypervvss Info <0000>: 
avhypervvss Error <41732>: Failed to collect the list of remote VMs
avhypervvss Error <41581>: Failed to backup targets. Unable to expand targets.
avhypervvss Error <41662>: Failed to validate and expand the targets.
avhypervvss Error <41659>: Backup did not complete successfully
avhypervvss Info <9772>: Starting graceful (staged) termination, Backup did not complete successfully (wrap-up stage)

Cause

The shared storage parameter has not been configured on the Hyper-V cluster.
This cluster parameter is required for the latest Hyper-V VSS hotfixes for v19.3, 19.4, 19.7 and 19.8.
The default versions of the Hyper-V VSS plug-in (19.4 and higher) also requires the parameter to be configured beforehand.

Resolution

To configure the shared storage path parameter for the Hyper-V cluster, follow the procedures documented in the following knowledge base article:

https://www.dell.com/support/kbdoc/en-us/000211510

Once the parameter has been configured on the Hyper-V cluster, retry the Hyper-V backup.

IMPORTANT:  This is a one-time change during the lifetime of the Hyper-V cluster. It must be carefully planned and set on a CSV or SMV shared storage accessible to all nodes. If unsure about how to make this change, consult with the Hyper-V administrator before proceeding.

Additional Information

List of Hyper-V plug-in's latest cumulative hotfixes:
  • Avamar Plugin version 19.4.100-124 HF 337285
  • Avamar Plugin version 19.7.100-82 HF 337450
  • Avamar Plugin version 19.8.100-83 HF 337654
Note: For Avamar Hyper-V plug-in version 19.4.100-116 or below, upgrade to 19.4.100-124 or later and apply the corresponding HF.

Affected Products

Avamar
Article Properties
Article Number: 000212823
Article Type: Solution
Last Modified: 18 Aug 2023
Version:  1
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