IBM eServer xSeries 255 Installation Manual page 38

ACT (activity) LED: This green LED is on when there is activity on the server.
INFO (system information) LED: When this amber LED is on, the server power sup-
plies are nonredundant, or some other noncritical event has occurred. The event is
recorded in the Error log. Check the Light Path Diagnostics panel for more detailed
information.
FAULT (system-error) LED: This amber LED is on when a system error occurs. An
LED on the Light Path Diagnostics panel will also be on to further isolate the error.
Hard disk drive activity LED: Each hot-swap drive has a hard disk drive activity LED.
When this green LED is flashing, the drive is being accessed.
Hard disk drive status LED: Each hot-swap drive has a hard disk drive status LED.
When this amber LED is on continuously, the drive has failed. If an optional SCSI or
RAID adapter is installed in the server, when the LED flashes slowly (one flash per
second), the drive is being rebuilt. When the LED flashes rapidly (three flashes per
second), the controller is identifying the drive.
Diskette drive activity LED: When this LED is on, it indicates that the diskette drive
is in use.
Diskette-eject button: Press this button to release a diskette from the drive.
CD-ROM drive activity LED: When this LED is on, it indicates that the CD-ROM drive
is in use.
CD-eject button: Press this button to release a CD from the drive.
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IBM xSeries 255 Type 8685:Installation Guide