v CD-RW/DVD eject button: Press this button to release a DVD or CD from theCD/DVD drive.v CD-RW/DVD drive activity LED: When this LED is lit, it indicates that theCD-RW/DVD drive is in use.v Hard disk drive status LED: This LED is used on SAS hard disk drives. Whenthis LED is lit, it indicates that the drive has failed. If an optional IBM ServeRAIDcontroller is installed in the server, when this LED is flashing slowly (one flashper second), it indicates that the drive is being rebuilt. When the LED is flashingrapidly (three flashes per second), it indicates that the controller is identifying thedrive.v Hard disk drive activity LED: This LED is used on SAS hard disk drives. Eachhot-swap hard disk drive has an activity LED, and when this LED is flashing, itindicates that the drive is in use.Light path diagnostics panelThe light path diagnostics panel is on the top of the operator information panel.To access the light path diagnostics panel, push the release button on the operatorpanel to the left. Pull forward on the unit until the hinge of the operator panel is freeof the server chassis. Then pull down on the unit, so that the operator informationpanel is at a right angle with the server.Release buttonOperator informationpanelLight path LEDsThe following illustration shows the LEDs and controls on the light path diagnosticspanel.12 IBM System x3550 Type 7978: User’s Guide
