V11 Service Pack 12

Microsoft Hyper-V

The Virtual Server Agent provides a unified protection and recovery vehicle for all virtual machine data in a Hyper-V cluster or a standalone Hyper-V server. In addition to protecting entire virtual machines for disaster recovery, the Virtual Server Agent (VSA) also provides granular recovery of files and folders within virtual machines. Additional options such as customized automatic discovery, deduplication, and reporting, ensure all your virtual machine data is easily traceable and retrievable whenever the need arises.

The VSA for Microsoft Hyper-V enables you to perform backup and restores and manage virtual machine data in complex virtualized environments.

Key Features



Additional information

Agentless backups and restores

A VSA proxy manages backup and restore operations for guest VMs in your environment, eliminating the need to install agents on guest VMs.

Deployment Planning for Microsoft Hyper-V

"Incremental forever" data protection

After an initial full backup, you can perform ongoing incremental backups to capture changes for the source VM.

Commvault uses Changed Block Tracking (CBT) to identify changes for each incremental backup.


Disaster recovery

Ensure that virtual machines can be recovered in the event of a disaster or other outage. DR orchestration features include planned and unplanned failovers, failback, and test boots.

Disaster Recovery for VMware

Simplified management interface

Administration of virtual machine protection uses smart defaults to reduce configuration and support self service options for end users and groups.

Virtualization Support in Command Center

Web Console

VM Lifecycle Management

Single point of administration

The Virtual Server Agent uses a virtualization client that serves as a single point of administration for all cluster nodes. All administrative activities, such as backups, restores, schedules, and reports, can be performed from the virtualization client.

To perform backup operations, each virtualization client can include multiple proxies where the Virtual Server Agent is installed.  The virtualization client also enables proxy teaming, enabling proxy failovers for fault tolerant backups. Using multiple proxies for each virtualization client makes it possible to perform backups for a large number of virtual machines in a limited backup window.

Creating a Virtualization Client

Automatic protection for all virtual machines in a cluster or server

After you configure the Virtual Server Agent for a cluster or a server, all virtual machines in the Hyper-V cluster or server are automatically selected for backup. This behavior is designed to ensure that all virtual machines are backed up.

Excluding Unprotected Virtual Machines in the Default Subclient

Application-aware backups

Protect application data without installing guest agents on virtual machines.

Application-Aware Backups

Customized discovery and protection of migrated virtual machines

If you want to backup only specific virtual machines in a cluster or a server, you can set criteria to search the virtual machines and automatically select them for backup. This is useful in environments where virtual machines are frequently added or removed . You can easily browse and select objects such as CSV or hosts, to set criteria for automatic discovery.

The virtual machines in a cluster are seamlessly backed up even if virtual machine migrate to a different host. When the cluster is backed up, incremental backup cycles are also maintained.

Adding Subclient Content Using Discovery Rules

Customized filters

If you want to exclude specific virtual machines from the backup, you can set criteria to filter virtual machines.

Subclient Configuration - Filtering Virtual Machines from a Backup

VM conversion

When restoring a VM, you can choose to restore to a different hypervisor. This capability can be used to migrate VMs to a different virtualization platform.

Virtual Machine Conversion


You can view a detailed report about each backed up virtual machine. It contains information such as size of the data, status of integration services, guest operating system, the host on which the virtual machine is running, and so on. You can view all this information from the CommCell console when the backup job is running. It appears on the Virtual Machine Status tab of the View Job Details dialog box.

Reports for Virtual Server Agents

System Center plug-in

You can install the Commvault System Center plug-in to manage backups and recovery of Hyper-V virtual machines from within the System Center on the Command Center.

The Command Center is a web-based user interface for administration tasks that provides default configuration values and streamlined procedures for routine data protection and recovery tasks. You can use the console to set up your data protection environment, to identify content that you want to protect, and to initiate and monitor backups and restores. To learn more about the solutions available in the Command Center, visit the Commvault Solutions for Data Protection and Recovery website.

Installing and Launching the System Center Plug-In

Commvault Platform Features

The following features are available throughout Commvault and are not limited to the Virtual Server Agent.



Additional information

Policy-driven data protection

Policies drive operations to meet service level agreements (SLAs).

Schedule Policies

Storage Policies

Subclient Policies

Monitoring Policies

Block-level deduplication

Deduplication provides an effective way of storing data by identifying and then eliminating the duplicate items in a data protection operation.

Deduplication at the data block level compares blocks of data against each other. If virtual machines contain blocks of data that are identical to each other, block-level deduplication eliminates the storage of redundant data and reduces the size of the data in storage. This elimination dramatically reduces the virtual machine backup data copies on both the disk and tapes.

Deduplication Overview

Built-in compression

Commvault storage policies automatically enable compression to reduce the quantity of data sent to storage.

Data Compression

Data Compression for VSA


To view the list of terminologies used in the documentation, see Supported Hypervisors for Virtual Server Agent.

Last modified: 10/16/2018 9:40:37 PM