Within each facility, messages are listed by the severity level, from highest to lowest. Each message is followed by an explanation and a recommended action.
Messages appear only when the system remains operational.
A facility can be a hardware device, a protocol, or a module within the system software. See Table 1-1 . A severity level is a single digit from 0 to 7 that reflects the severity of the condition. The lower the number, the more serious the situation. Table 1-2 lists the severity levels.