Dell DD and PowerProtect Hardware 8.0 Features and Specifications

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Back panel

For redundancy, the shelf has two identical power supply/cooling modules and two identical shelf controllers which are placed in reverse order.

NOTE:When replacing a component, note its orientation before removing it. Insert the replacement in the same position.

Power supply A and controller A are located at the bottom of the chassis, and power supply B and controller B are located at the top of the chassis.

Back panel, power modules, with controller B above controller A — Figure 1. Back panel: Power modules and controllers

LEDs
- Power supply B: Power LED
- Power fault: Amber
- Blower fault: Amber
Expansion (Out)
Host (In)
Enclosure address (not used)
Power (Green) or Fault (Amber)
Bus ID (not used)
Host link active
Expansion link active
LEDs
- Power supply A Power LED
- Power fault: Amber
- Blower fault: Amber

LEDs for controller A — Figure 2. Power Supply A LEDs

Each shelf controller has two SAS ports. The port labeled with a circle symbol is the Host port, and the port labeled with a diamond symbol is the Expansion port. The Expansion ports are located on the outside, and the Host ports on the inside (reversed controller positions).

Table 1. Status lights visible from rear of disk enclosure
Light	Quantity	Color	Meaning
Controller Power	1 per Controller	Blue or Green	On when the Controller is powered on.
Controller Fault	1 per Controller	Amber	On when either the Controller or a SAS connection is faulty. On during power-on self-test
Host Link Active	1 per Controller	Blue	On when the host connection is active.
Expansion Link Active	1 per Controller	Blue	On when the expansion connection is active.
Power Supply Active	1 per power supply	Green	On when the power supply is operating.
Power Supply Fault*	1 per power supply	Amber	On when the power supply is faulty or is not receiving AC line voltage. Flashing when either a multiple blower or ambient over temperature condition has shut off DC power to the system.
Blower Fault*	1 per power supply	Amber	On when one of the blowers in the power supply is faulty.

*The ES30 and continue to run with a single power supply and three of its four blowers. Removing a power/cooling module constitutes a multiple blower fault condition, and powers down the shelf unless you replace a module within two minutes.