This variable summarizes the status of several key elements of the device. OK: - When all temperature sensors are below the warning threshold (eg. for Fan rear to front direction < 60 C; for Fan front to rear direction < 55 C); - All 4 fan modules are good. A module is considered good if both fans in the module are running at >= 500 RPMs; - Both power supplies are on; - No panic dump exists in flash. Non-critical: - One or more temperature sensors are in the warning range (eg. for Fan rear to front direction >= 60 C and < 80C for Fan front to rear direction >= 55 and < 80 C); - A panic dump exists in flash. Critical: - One or more temperature sensors are in the failure range (eg. for Fan rear to front or front to rear direction >= 80 C); - There are < 3 good fan modules; - One power supply is off.