Table 5-9 Disk Drive LEDs
DescriptionFlash RateStatus LEDActivity LED
Normal operation, power appliedSteadyGreenOff
Green stays on during foreground drive self-testSteadyOffGreen
I/O Disk activityFlutter at rate of
activity
OffGreen
Predictive failure, needs immediate investigationFlashing at 1Hz or
2 Hz
YellowOff
Operator inducing manuallyFlashing at 0.5Hz
or 1Hz
YellowOff
Module fault, criticalSteadyYellowOff
Unit not powered or installedLEDs offOffOff
Interlock Switches
There are three interlock switches located in the server. Both side covers and the top cover have
an interlock switch located underneath each cover.
• Side Covers—If either side cover is removed while the system is powered on, the system
fans on the front and rear increase in speed to ensure adequate cooling. An event code is
generated to indicate a side cover was removed.
• Top Cover—If the top cover is removed while the system power is on, the PCI-X card cage
assembly I/O fan speed will not change. An event code is generated to indicate the top cover
was removed.
Server Management Subsystem Hardware Overview
Server management for the server is provided by an MP on the core I/O board. The server
management hardware is powered by standby power that is available whenever the server is
plugged into primary AC power. This allows service access even if the DC power to the server
is switched off.
The MP communicates with the server subsystems, sensors, and PDC by internal buses.
Connection to the management processor is by way of three I/O paths:
• An RS-232 port for a local terminal
• A 10/100/1000 baseT LAN port (Web console)
When the server is configured with one core I/O board, that board must be in slot 1, since the
primary MP is always on the core I/O board in slot 1.
When the server is configured for two partitions, it must contain two core I/O boards, one for
each partition. It will also contain two MPs. In this case, the MP in slot 1 is the primary MP and
provides all of the server management functions. The MP on the core I/O board in slot 0 is a
secondary MP and redirects the operating system gettys to the primary MP over an internal
132 Server Troubleshooting
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