Web Server: System Requirements

The following requirements are for the Web Server.

Operating System


Use the most recent version of the operating system that is listed. The Commvault software fully supports the most recent version of an operating system, until the vendor ends support. More recent versions of the Commvault software might not install on operating systems that are not supported by the vendor anymore. For information about the support lifecycle of an operating system, contact the vendor.

Operating System

Microsoft Windows Server 2019 (Standard, Datacenter) (64-bit only)

Microsoft Windows Server 2019 Editions

Windows 2016

Microsoft Windows Server 2016 Editions

Nano Servers are not supported. For more information, see Considerations for Microsoft Windows Server 2016.


All Windows-compatible processors are supported.

Additional Software

  • If you use an Exchange agent, install Microsoft Outlook x64 Editions to support Exchange email recovery.

  • If you use the Domino Mailbox Archiver, install Notes Client Release 8 or higher to support Domino email recovery.

Restore Cache Directory

Minimum of 500GB is required for the restore cache directory. The exact requirements may vary depending on the number of users accessing the Web Console to download files or perform Export and Legal Hold operations.

Hardware Specifications

The hardware requirements for Web Server installed on either physical or virtual machines is explained in Hardware Specifications for Web Server.


  • The software installation requires 30 GB of disk space for Microsoft SQL Server application and database and 20 GB of temp space on the drive where the temp directory resides.

  • The job results directory for the File System agent that is installed on the Web Server should have enough space to cache the search restores from users. This depends on the number of files that may be restored, disk quota, and the retention period configured by the administrator.

  • In time, you may need to provide additional space (several GB) to allow for growth in the Web Server database. The size of the metadata depends on the search operation performed and quantity of data stored.

Cluster Support

You can install the software on a cluster, if clustering is supported by the operating system. For information about supported cluster types, see Support for Cluster Configuration.

Database Engine

Microsoft SQL Server 2016 Express Edition is automatically installed during the installation of the Web Server software.

For more information, see Database Engine under System Requirements - CommServe.


During the installation of this software component, the File System Agent is installed if it is not already installed. See the system requirements for the Microsoft Windows File System Agent.


To successfully restore NAS data and Domino emails on the web, install a 32-bit File System proxy instance on a 64-bit machine.

The operating system locale of the Web Server must be set to English (United States). If you change the system locale, you must restart the Web Server computer.

Outlook Add-In and ContentStore Email Viewer

The following requirements must be met to use Web Server with the Outlook Add-In and Outlook Add-In with ContentStore Email Viewer:

  • Use a dedicated Web Server when you deploy Outlook Add-In with ContentStore Email Viewer on more than 400 mailboxes.

  • Microsoft Outlook with the latest service pack. Also, to take advantage of Web Server capabilities from the Outlook Add-In, make sure that the latest service pack for Microsoft Outlook is installed on the client where Outlook Add-In is installed.

  • Microsoft Outlook 2007 or later, or IBM Notes. NOTE: The 32-bit applications on a 64-bit server will require a second 32-bit File System agent. For x64, use Microsoft Outlook 2010 or later.

  • Microsoft Outlook must be installed on the MediaAgent computer to perform content indexing of Exchange and IBM Notes data.

  • Upgrade all Exchange clients and Outlook Add-In users to Commvault Version 11.

Internet Information Services (IIS)

IIS must be enabled on the computer that you install the Web Server on.

.NET Framework

Microsoft .NET Framework 3.5 Service Pack 1 and 4.6 are required and are automatically installed.

.NET Core Hosting Bundle

Microsoft .NET Core Hosting Bundle 2.1.5 is required and is automatically installed.


If it is necessary to upgrade the .NET Core Hosting Bundle to the latest version, run the ASP.NET Core Runtime 2.1.x.


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.