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4-1
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
4
Troubleshooting Hardware
This chapter describes how to identify and resolve problems that might occur in the hardware
components of the Cisco MDS 9000 Family. It includes the following sections:
• Overview, page 4-1
• Troubleshooting Startup Issues, page 4-2
• Troubleshooting Startup Issues, page 4-2
• Troubleshooting Power Supply Issues, page 4-3
• Troubleshooting Fan Issues, page 4-8
• Temperature Threshold Violations, page 4-11
• Troubleshooting Clock Module Issues, page 4-12
• Troubleshooting Other Hardware Issues, page 4-13
• Troubleshooting Supervisor Issues, page 4-14
• Troubleshooting Switching and Services Modules, page 4-21
Overview
The key to success when troubleshooting the system hardware is to isolate the problem to a specific
system component. The first step is to compare what the system is doing to what it should be doing.
Because a startup problem can usually be attributed to a single component, it is more efficient to isolate
the problem to a subsystem rather than troubleshoot each separate component in the system.
Problems with the initial power up are often caused by a module that is not firmly connected to the
backplane or a power supply that has been disconnected from the power cord connector.
Overheating can also cause problems with the system, though typically only after the system has been
operating for an extended period of time. The most common cause of overheating is the failure of a fan
module.
The Cisco MDS 9000 Family includes the following subsystems on most chassis:
• Power supply— This includes the power supply fans.
• Fan module—The chassis fan module should operate whenever system power is on. You should see
the Fan LED turn green and should hear the fan module to determine whether or not it is operating.
If the Fan LED is red, this indicates that one or more fans in the fan module is not operating. You
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