See if the below documentation steps help you out:
Since you have a Commvault proxy in the DR side, i would install a CommServe to the DR side, and a SQL agent in a second instance on the DR CommServe. The sql agent should be installed to the Production Commserve but physically on the DR CommServe. Then you can setup log shipping to the DR Commserve. This will sync up your database to the DR site.
That is the most basic setup, however you can setup the full CS Failover feature as listed in the documentation link.