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The application-aware mode for Hyper-V uses the Volume Shadow Copy Service (VSS).

Hyper-V 2012

Hyper-V 2012 doesn't have an implementation of VSS, so when the Application-aware mode is enabled, the checkpoint works as follows:

  • NAKIVO Backup & Replication injects a runtime VSS Driver into the VM.
  • NAKIVO Backup & Replication requests the VSS Driver to create a quiesced checkpoint.
  • VSS Driver uses VSS inside a Windows VM to freeze I/O requests of applications inside the OS.
  • If OS quiescing fails to create an application-consistent checkpoint, NAKIVO Backup & Replication displays this error.