Disk LEDsFigure 25: Disk activity LEDsDD560, DD460, DD430, and DD410 Systems 65Hardware OverviewEach disk has two LEDs at the bottom of the disk carrier. See Figure 25. The right LED on eachdisk flashes green whenever the system accesses the disk. The left LED glows red when the diskhas failed. Both LEDs are dark on the disk that is available as a spare.Back PanelPowersupplyunitsHardware interface panel System card interfacesFigure 26: Back panelThe back panel has three major functional areas: the power supply units, a hardware interfacepanel, and a system card interface area. See Figure 26.
