3-3
Cisco UCS C420 Server Installation and Service Guide
OL-27640-01
Chapter3 Maintaining the Server
Status LEDs and Buttons
Table3-1 Front-Panel LEDs States
LED Name State
Hard drive ac tivity •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.