Article number
Affected Versions
Source Hypervisor
Target Hypervisor

Problem with VRA Install Fails due to Host Failing to Create/Access a Directory or Attaching a Disk to the VRA VM

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An administrator may witness a VRA Install failure on a Hyper-V host due to either the host cannot create/access a folder or the host cannot attach a certain drive to the VRA.

Root Cause

UAC is enabled on the host which interferes with successful VRA installation.


There are two potential errors that can be found within the ZVM logs for this issue:

The host is unable to create/access a directory:

Failed to create directory XXXX on host XXXX System.TimeoutException TResult Run[TResult](Zerto.Zvm.Common.VirtualizationManager.VCenter.HostIdentifier, Zerto.HyperVAgent.Request`1[TResult], System.Nullable`1[System.Int32]) System.TimeoutException: The operation has timed out.

The host cannot attach a certain drive to the VRA:

Cmdlet execution error. Command: New-SCVirtualDiskDrive. Parameters: Path=D:\ZertoVMs\Z-VRA-XXXX, FileName=vra.vhd, VM=Z-VRA-XXXX, IDE=, UseLocalVirtualHardDisk=, LUN=0, Bus=0. 0. [Error: 12700.32768] Error Code : VirVMAsyncTaskError ; Message : VMM cannot complete the host operation on the 'XXXX' server because of the error: 'Z-VRA-XXXX' failed to add device 'Synthetic Disk Drive'. 


To workaround this issue, simply disable UAC on the Hyper-V host where the VRA is being installed. After successful installation, UAC can be re-enabled.