System Requirements for Virtual Server Agent with Nutanix AHV

Nutanix AHV Requirements

  • Commvault software is supported with Nutanix AHV versions 4.6, 4.7, 5.0, 5.1.x.x, 5.5.x.x, 5.6.x, 5.8.x, 5.9.x, 5.10.x, 5.11, 5.15, 5.17.x, and 5.18.x

  • To support other hypervisors that run on a Nutanix cluster, you must configure a virtualization client for that hypervisor. Supported hypervisors include:

    • Microsoft Hyper-V

    • VMware

  • For Nutanix Controller VMs (CVMs), configure Cluster Virtual IP.

  • If you are using V3 API: To run backups, your user account must have admin permissions (super user) with all roles defined, or you must configure AD services, and then map the AD user account to the Cluster Admin role and Self Service Portal admin roles via their Self Service Portal. For more information, contact Nutanix Support & Services.

  • For application consistent backups of user virtual machines, ensure the following requirements are met:

    • Install Nutanix Guest Tools software on each virtual machine (VM).

    • Ensure that the CVM Virtual IP (port 2074) is accessible from user VMs.

    • Update cluster to Nutanix AHV version 4.6 or later.

    • If virtual machines are added in a user-created protection domain, then the Nutanix Administrator must enable the Use Application Consistent Snapshots option in the Nutanix console while adding these virtual machines. However, if the virtual machines are not added in a user-created protection domain, then Commvault automatically creates a protection domain and enables the application consistent backup feature during the backup operation.

    Note: Application consistent snapshots are not supported for virtual machines that contain delta, SATA, and IDE disks.

Quiescing for Application Consistent Backups

Windows VMs take application consistent snapshots using the Volume Shadow Copy Service (VSS) framework.

Linux VMs use pre-freeze and post-thaw scripts instead of VSS:

  • Scripts are located in /sbin/pre_freeze and /sbin/post_thaw folders.

  • The user account that runs the scripts must have root:root access with 700 permissions.


To perform application consistent backups, each virtual machine must be in a separate consistency group. If a subclient includes a consistency group with multiple VMs, the backup for those VMs fails.

CommServe Requirements

See System Requirements - CommServe.

MediaAgent Requirements

See System Requirements - MediaAgent.

Virtual Server Agent (Proxy) Requirements

You must install the Virtual Server Agent (VSA) on at least one virtual machine in the Nutanix Acropolis Hypervisor (AHV) cluster. The VSA proxy can access virtual machines and storage throughout the cluster. You can deploy additional VSA proxies as needed for load balancing.

The Virtual Server Agent should be installed on virtual machines that meet the following requirements.

  • Minimum of 100 GB disk space recommended.

  • Minimum of 4 GB RAM required beyond the requirements of the operating system and running applications.

The Virtual Server Agent can be deployed on VMs running either of the following operating systems:

  • Windows Proxies

    • Microsoft Windows Server 2019 (including Core Edition)

    • Microsoft Windows Server 2016 (including Core Edition)

    • Microsoft Windows Server 2012 R2 (including Core Edition)

    For Windows proxies, use the Windows diskpart command to disable automount and set the SAN policy to OfflineAll. If these features are enabled, they interfere with disk HotAdd operations that are performed as part of backup and restore jobs.

  • Linux Proxies

    • CentOS 6.6, 7.1

    • RHEL 6.6, 7.1

    For Linux proxies, disable lvmetad to avoid issues with HotAdd operations during backup and recovery.

Port Requirements

  • For application consistent backups of user VMs, ensure that user VMs can access Nutanix Controller VMs using the CVM Virtual IP (port 2074).

  • Ensure that the CommServe computer, MediaAgents, and Virtual Server Agent can communicate with Nutanix AHV using Prism port 9440.

Guest Operating Systems

Virtual machines being backed up can have any of the guest operating systems that are supported by the Nutanix AHV platform.

Hardware Specifications

For information about hardware requirements for the Virtual Server Agent, see Hardware Specifications for Virtual Server Agent.


Third-party maintenance (minor) releases or service packs that are supported by the Commvault software may not be listed in our System Requirements. When possible, Commvault provides information on any known issues related to these minor releases or service packs. In some cases, these minor releases or service packs affect how the Commvault software works. Commvault software may experience changes in functionality as the result of the third-party minor release or service pack. These changes are beyond the control of Commvault. Platforms that are supported in the current version of Commvault software may not be supported in earlier versions of the software. Contact your software provider to ensure that third-party minor releases or service packs are compatible with the Commvault software. Additional considerations regarding minimum requirements and End-of-Life policies from third-party vendors also apply.