Troubleshooting

Solutions to Data Protection for Microsoft Hyper-V issues are provided.

Virtual machine backup fails with the 0x800705B4 error in the Hyper-V event log

During VM backup operations on Windows Server 2016, this error can occur if you run a resilient change tracking (RCT) full backup of a virtual machine (VM) with many VM disks. The snapshot operation either times out or runs out of space on the file space on the server.

If the VM backup operation fails, search the Hyper-V event log for the 0x800705B4 error. If this error is present, complete the following steps to help improve the performance of the snapshot operation:
  1. Ensure that the Hyper-V VM is a generation 2 VM.
  2. Ensure that only SCSI disks are attached to the generation 2 VM (instead of a mix of SCSI and IDE disks).
  3. Move the Hyper-V snapshot folder from the default location (C:\ProgramData\Microsoft\Windows\Hyper-V\Snapshots) to a faster drive that is not the Windows system drive (for example, the D: drive).