Use Case: Executive, Executive Package: Exec_CheckSystem

When the ALMA Observing System is active it will continously check if all required resources are available. If malfunctions are detected the Operator is alerted. S/he can then try to solve problems e.g. by shutting down or re-initializing the relevant systems.

Goal:   Check the system status/alert operator of problems.

Contact Author:   P. Grosbol

Role(s)/Actor(s):
Primary:  

• Operator
  

• Database
  

Priority:   Critical

Performance:   On the order of seconds

Frequency of Use:   A few times per week

Preconditions:

1. The ALMA software system is running.
2. Main operator GUI is available.

Basic Course:

1. The operator notice that a component/subsystem is in an error state as indicated by the operator GUI.
2. Looking on the error tree provided is determines which subsystems are effected.
3. The relevant components/subsystems are shutdown which may include suspension of observations.
4. Other maintenance actions are initiated (e.g. change of hardware)
5. The relevant subsystems are started again
6. The GUI indicates that all systems are operational.
7. Normal operations is resumed including start of observations
8. Alternative Course:
   
   • Standard re-initiation of components/subsystems does not solve the failure.
   • Full system is shutdown
   • Detailed error logs are analyzed
   • Appropriate patched are provided and system restarted.

Postconditions:

1. Failing subsystem/component is working
2. Executive continues to monitor system performance

Issues to be Determined or Resolved:  

1. none at this time

Last modified: 31oct03