High Availability Guide : Watchdog sample : HotStandby configuration using Watchdog : Using the sample Watchdog application
  
Using the sample Watchdog application
About this task
Initially, you should start the Watchdog after both servers are up and connected.
Procedure
To start the Watchdog, go to the current working directory of the Watchdog and at the prompt, issue the command:
watchdog
If you have not specified the usernames and passwords for connect1 and connect2 servers (capable of serving as Primary and Secondary) in the solid.ini file, the Watchdog prompts you for them.
Results
When started, the Watchdog pings both servers to check which one is Primary. The Watchdog remains in normal mode unless it detects a server failure after the number of retry attempts is exceeded. If a failure occurs after the Watchdog sends the last retry attempt to the server, the Watchdog switches to failure mode. When both the Primary and Secondary servers are up and reconnected, the Watchdog switches to normal mode.
See also
HotStandby configuration using Watchdog