Optimize Backup Success: Exclude Passthrough Disks for Guest Machines

Backup Success with Exclusions: Passthrough Disks Excluded for GuestMachine

KB ID: 104025
Summary:
This knowledge base article highlights the successful completion of a backup operation for a virtual machine named GuestMachine. The backup procedure specifically excluded passthrough disks associated with the VM. This article provides insights into the cause, solution, and additional information regarding this scenario.
Cause:
The displayed message is typical when a virtual machine intended for backup via the Hyper-V host possesses a passthrough disk configuration.
Solution:
To address this situation, it's necessary to take the following steps:
1. Exclude the passthrough disk from the virtual machine.
2. Initiate the backup process once the passthrough disk has been excluded.
More Information:
  1. The presence of passthrough disks in a virtual machine configuration is not compatible with the backup process. If a virtual machine has both a normal disk and a passthrough disk, the passthrough disk will be omitted from the backup while the normal disk will be included.
  2. As of now, BDRShield does not support the backup of passthrough disks. This limitation is due to BDRShield utilizing the Hyper-V VSS writer for VM backup operations, a feature that is not supported for passthrough disks (as per Microsoft's constraints).

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