My co-worker Matthijs Vreeken writes about a serious issue when backing up CSV 2.0 volumes on Windows Server 2012 Hyper-V. Host-based backups could bring down most of the VMs on the volume. This can be a serious show stopper if you plan to migrate to Windows Server 2012 Hyper-V.
In this scenario, one of the following issues occurs:
- The backup is created, and the virtual machine enters a paused state.
- The CSV volume goes offline. Therefore, the virtual machine goes offline, and the backup is not created.
- VMs stop responding while the backups runs
More info here