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During the install of a secondary DSA Server (using the same masthead), you will be asked about a primary Server’s database location. After install is finished, the Relays.dat file, which contains information used in the IBM BigFix relay selection algorithm, will be updated in the actionsite of the deployment (by default it’s Windows location is: C:\BigFix Enterprise\BES Client__BESData\actionsite). That way every Client knows about all the available Servers and Relays.
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In order for the fail over process to successfully occur you must set the DSA Server as the Secondary Relay in client settings (manually using __RelayServer2) for the top-level Relays (or via the Console Computer right-click settings user interface). When a failure on the Primary IBM BigFix Server occurs and lower level Relays are unable to report they will use the Secondary relay value during normal relay selection process to find and report to the Secondary Server.
For more details: