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3-3
Cisco UCS C420 Server Installation and Service Guide
OL-27640-01
Chapter 3 Maintaining the Server
Status LEDs and Buttons
Table 3-1 Front-Panel LEDs States
LED Name State
Hard drive activity
• Off—There is no hard drive in the hard drive tray (no access, no fault).
• Green—The hard drive is ready.
• Green, blinking—The hard drive is reading or writing data.
Hard drive fault
• Off—The hard drive is operating properly.
• Amber—This hard drive has failed.
• Amber, blinking—The device is rebuilding.
Power button/Power status LED
• Off—There is no AC power to the server.
• Amber—The server is in standby power mode. Power is supplied only to the CIMC
and some motherboard functions.
• Green—The server is in main power mode. Power is supplied to all server
components.
Identification
• Off—The Identification LED is not in use.
• Blue—The Identification LED is activated.
System status
• Green—The server is running in normal operating condition.
• Green, blinking—The server is performing system initialization and memory check.
• Amber, steady—The server is in a degraded operational state. For example:
–
Power supply redundancy is lost.
–
CPUs are mismatched.
–
At least one CPU is faulty.
–
At least one DIMM is faulty.
–
At least one drive in a RAID configuration failed.
• Amber, blinking—The server is in a critical fault state. For example:
–
Boot failed.
–
Fatal CPU and/or bus error is detected.
–
Server is in an over-temperature condition.
Fan status
• Green—All fan modules are operating properly.
• Amber, steady—One fan module has failed.
• Amber, blinking—Critical fault; two or more fan modules have failed.
Temperature status
• Green—The server is operating at normal temperature.
• Amber, steady—One or more temperature sensors have exceeded a warning
threshold.
• Amber, blinking—One or more temperature sensors have exceeded a critical
threshold.