63290: Acronis Cyber Backup 12.5: Windows VDI does not work if Agent for Hyper-V is installed

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Symptoms

1. You have a Hyper-V host with Virtual Desktop Infrastructure role;

2. You install Acronis Agent for Hyper-V;

3. When you try to create a new automatic collection, creation fails with 

Could not retrieve the virtual desktop template details for <VM_Name>

Cause

SAN policy is set to Offline All during Agent for Hyper-V installation. This change is necessary to prevent Windows from breaking the bootability of the VMs recovered and/or converted from backups by Agent for Hyper-V.

If SAN policy is not set to Offline All, then tasks for VM recovery/VM conversion may produce warnings and unbootable VMs due to automatic mounting of the virtual disks performed by Windows which adds changes to partitions structure.

Solution

In order to create a collection in VDI, change SAN policy to Offline Shared:

  1. On Hyper-V host, Log on as an administrator, open the command prompt, type diskpart, and then press Enter.
  2. Type san, and then press Enter. Ensure that SAN Policy : Offline All is displayed.
  3. Type san policy=offlineShared and press Enter.
  4. Restart the machine.

It is recommended to change SAN policy back to Offline All (san policy=offlineall) after collection creation, to avoid warnings related to VM recovery/conversion.

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