Basic phases in a NetBackup backup of a Hyper-V virtual machine
The following tables describe the phases of the NetBackup backup process for the two Hyper-V backup methods: VSS and WMI.
Table: VSS backup method: Phases of NetBackup for Hyper-V backup
Phase | Description |
|---|---|
Phase 1 | The NetBackup primary server initiates the backup. |
Phase 2 | The NetBackup client on the Hyper-V host initiates a snapshot. |
Phase 3 | On Windows 2012 hosts: The VSS Hyper-V writer quiesces the Windows virtual machine (places the data in a consistent state) and creates the snapshot on the host volume. If the Hyper-V writer cannot quiesce the virtual machine, the virtual machine is placed in the Saved state before creation of the snapshot. On Windows hosts: The Hyper-V writer quiesces the Windows virtual machine and creates a |
Phase 4 | On Windows 2012 hosts: If the virtual machine was placed in the Saved state, Hyper-V returns the virtual machine to its original state. |
Phase 5 | The NetBackup client on the Hyper-V host reads the data from the snapshot of the virtual machine and transfers the data to the media server. The media server writes the data to the NetBackup storage unit. |
Phase 6 | The NetBackup client on the Hyper-V host deletes the host volume snapshot. |
Table: WMI backup method: Phases of NetBackup for Hyper-V backup
Phase | Description |
|---|---|
Phase 1 | The NetBackup primary server initiates the backup. |
Phase 2 | The NetBackup client on the Hyper-V host initiates a virtual machine snapshot (checkpoint). |
Phase 3 | On Windows 2016 hosts or later, the NetBackup client on the Hyper-V host creates a virtual machine snapshot (checkpoint).
If the backup uses block-level incremental backup (BLIB), the snapshot is converted to a reference point. Resilient change tracking (RCT) is used to perform faster backup of the virtual machines by moving only the blocks that have changed between backups. As a result of the virtual machine snapshot (checkpoint), the Note: The option is set on the policy's Hyper-V tab, under Advanced.... |
Phase 4 | The NetBackup client reads the data directly from the virtual machine files on the Hyper-V host and transfers the data to the media server. The media server writes the data to the storage unit. |
Phase 5 | The NetBackup client on the Hyper-V host deletes the virtual machine snapshot (checkpoint).
As a result, the |