When upgrading or reinstalling VMWare Site Recovery Manager (SRM), you may run into the following error:
This error can occur when you attempt to upgrade/reinstall SRM, and have decided to clear out the SRM database, or when you have done a reinstall of vCenter, the inventory service, or have cleared out the Inventory Service database.
There are two ways around this.
In case of using SQL server, you can simply remove all tables, but leave the database itself intact, allowing you to reselect the DSN during the SRM install.
An extended explanation about why this error occurs during the installation can be found here: