You can set up the High Availability CommServe Host for an existing CommServe server.
Procedure
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Review general guidelines to prepare your environment for setting up the CommServe LiveSync feature. 
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Upgrade the existing CommServe to the most recent Commvault Feature Release. 
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Install the CommServe Failover Package on the Production CommServe host. The SQL Server Agent and the CommServe Failover package must be installed as a second instance. 
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Configure connectivity to remote Web Server and Workflow Engine clients.