Chapter 4: Subsystem Operation and Monitoring
different LEDs that are present on the subsystem and their
functions. (See
Section 4.4
)
Audible alarm:
A beeper comes with the RAID controller board
and will be triggered if any of a number of threatening events
occurs. These events usually jeopardize the functional integrity
of the controller board and must be heeded at all times. Events
such as a breaching of the temperature th
reshold will trigger the
alarm. If a subsystem manager is present, he can use any of the
I
2
C:
An I
2
C bus connects to sensors or detection circuits that
reside on PSUs, backplane, cooling modules, and RAID
controller board. (See
Section 4.6
)
management tools to determine the cause of the alarm and take
appropriate measures. (See
Section 4.5
)
System Monitoring Overview
4-7
