# Planning for CommServe LiveSync Setup

Verify the prerequisites needed to setup the environment for the CommServe LiveSync feature.

Note

- When the production and standby CommServe hosts use the same operating system family (all Windows or all Linux), identical operating system versions and SQL Server versions (including feature releases) are required.*

  In mixed operating system configurations (for example, Windows production CommServe and Linux standby CommServe), operating system versions do not need to match. Any Commvault-supported operating system version for each platform can be used.

- To use an existing standalone DR CommServe to set up CSLiveSync for failover, you must uninstall the existing CommServe and all the Commvault software on the standalone DR CommServe computer, and then install the CSLiveSync standby/passive CommServe host as failover.

- Do not configure the Index server on the Web server which is also the CommServe server.

- Do not use the Download Center application from the Web server that is on the CommServe server.

Hardware | You must have the necessary hardware for setting up the CommServe server on the production host and the standby hosts. Note More than one standby host is supported. For more information on the hardware specification for the CommServe server, see Hardware Specifications for the CommServe Server.
Operating System | CommServe LiveSync can be set up on all operating systems supported by the CommServe server. For more information about the supported operating systems, see CommServe Server: System Requirements (Windows) and CommServe Server: System Requirements (Linux). Note CommServe LiveSync is not supported when the CommServe server is configured with Microsoft Failover Cluster.
License Requirements | CommServe Server No special licenses are required for setting up the CommServe server. SQL Server Agent You must have two Microsoft SQL Server agent licenses, one for the production CommServe host and the other for the standby CommServe host. For information about licensing, see the Commvault Licensing Program Guide.
Installation Packages | The following Commvault installation packages are required for setting up the production host and the standby CommServe hosts:* CommServe Additional packages are installed by default during the CommServe installation. For more information, see the Additional Packages Installed with the CommServe section in Preinstallation Checklist for the CommServe. CommServe Failover The SQL Server agent and the CommServe Failover package are automatically installed in a new instance. (No additional user intervention is needed.) MediaAgent Create a dedicated, non deduplicated storage policy for the LiveSync operation. Create the storage policy using a MediaAgent available in the standby site. If the MediaAgents must be available on the CommServe, then it must be installed in the instance in which the SQL Server agent and the CommServe Failover packages are installed. The MediaAgent version must be the same or higher than the production and standby CommServe hosts. Avoid hosting LiveSync storage in the cloud because the running time of backup and restore jobs will be more than usual. Note It is not recommended to install the MediaAgent on the CommServe, when the CommServe is setup with LiveSync. (MediaAgents needs persistent storage for the Deduplication Database (DDB) and Index Cache, which are local to the specific machine and hence not synchronized as part of the LiveSync operation.)
Firewall and Network Requirements | Note A default topology, Firewall Topology created for failover clients, is created for communication between the production and standby CommServe hosts using the port 8408. This default topology routes communication between the CommServe and the SQL instances and is created irrespective of the option selected for communication. Hence, it is important to verify and ensure that production and standby CommServe can reach other's cvd and tunnel default ports 8405 and 8408 respectively. To facilitate communication between the clients and the CommServe, verify the following conditions: Both the active host and the passive CommServe hosts can reach the tunnel ports that are associated with the SQL clients in both the active host and the passive CommServe hosts. If the SQL clients are used as the proxy, verify that all the clients in the CommCell environment can communicate with the tunnel port and hostname of the SQL clients in both the active host and the passive CommServe hosts. If a dedicated proxy is already set up and available in your environment, use this dedicated proxy to communicate with the CommServe server. Note A dedicated proxy is recommended in environments with a large number of clients. (5000 or more approximately.) See Also: Network TCP Port Requirements.
Client Communication with the CommServe (Optional) | By default, the SQL client is used as a proxy to route requests and responses between the CommServe server and the clients in the CommCell, before and after a failover. If necessary, you can setup an alternate client for this purpose. For more information, see Editing Client Communication With the CommServe.
Floating CommServe Name (Optional) | You can use a floating CommServe hostname to setup the CommServe failover. A floating CommServe hostname can be used either as an alternative to setting up a dedicated proxy, or in combination with an existing proxy setup. See Setting Up Failovers Using A Floating CommServe Name for more information.

* Any additional packages installed on the primary CommServe host, which includes other Commvault packages, or any third-party components, must be manually installed in the standby CommServe host. Also once the LiveSync operation is enabled, the LiveSync process will synchronize the information stored in the CommServe database from the production to the standby CommServe. For example, passwords and Additional Settings stored in the database. Any additional entities, such as third-party packages, scripts, registry keys, certificates, IIS settings, configuration files, etc. must be manually applied before or after failover as needed.

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