NOvA » NOvA Data Driven Trigger

h1. NDOS Shifter Instructions

h2. Starting the Trigger

*Here is how you start the trigger processes on the buffer nodes:*

*1. Click on the "DDT Manager" icon on the same display as NDOS Run Control:*

!ddt_icon.png!

*2. The following manager screen should pop up (you might have to scroll around the display to find it):*

!ddt_all_stopped.png!

*3. Click the "Start Group" button to start all of the processes and when they are all running it should look like this:*

!ddt_all_running.png!

h2. Stopping the Trigger

*1. Click the "Stop Group" button and wait until everything is pink (not running).*

*2. Click on File -> Exit to exit the manager:*

!ddt_exit.png!

h2. Recovering a Trigger

*Occasionally a trigger process might die, so you can recover it as follows:*

*1. Send an email to novaddt@fnal.gov telling us which trigger process died.  For example, trigger process 002 died here:*

!ddt_002_stopped.png!

*2. Right-click on the dead process and click "Start Process":*

!ddt_002_restart.png!

*3. Everything should be green again.*

*4. If the process dies more than twice in an hour, do not restart it again and notify us via email.*