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Basic Concepts of Fault Management
Alarm:
An alarm is generated when a device notifies users of a fault. Maintenance personnel learn the device running status and locate faults based on alarms.
Active alarm:
An active alarm is the notification of generating an alarm. For example, the hwFanInvalid alarm indicates that the fan is faulty.
Clear alarm:
A clear alarm is the notification of clearing an alarm. For example, the hwFanInvalidResume alarm indicates that the fan fault is rectified.
Each active alarm maps a clear alarm.
Event:
An event is generated to inform maintenance personnel of the device operating state.