Description
file:///T|/htdocs/stor-sys/ML6000/en/html/ch02.htm[9/17/2012 1:49:17 PM]
6 Upper and lower Ethernet ports on 9U Library Expansion Module
7 Module terminator connectors (CAN bus connectors)
Rear Power Switches
Rear power switches are located on each power supply. Turning off the rear power switch on a power supply removes all
power from the library. The rear power switches should be used in all emergency and service situations.
Warning: Turn off the rear power switch whenever you are servicing the library. In the event of danger to
personnel or property, immediately turn off the rear power switch and remove all power cords.
Caution: Except in emergencies, use the shutdown procedure before switching off the rear power switch. See
Shutting Down or Restarting the Library for instructions on how to shut down the library.
Power System
The library supports single and redundant power configurations. The single power configuration has a single AC line input and
single DC power supply. The redundant configuration has dual AC line input and dual DC power supplies.
If you have redundant power supplies, you can "hot swap" a power supply (power to the library remains on while you
exchange the hardware), and you can "hot add" power supplies to other modules (power to the library remains on while you
are adding the hardware).
Caution: At least one power supply must be plugged in at all times.
Warning: The power outlet must be available near the library and must be easily accessible.
Caution: The 9U Library Control Module and each 9U Library Expansion Module that contains drives must have at
least one power supply for every four drives. You can add a redundant power supply to each module. Installing one
power supply in one module and another power supply in another module does not provide redundant power; the two
power supplies must reside in the same module.
The power system consists of the following components:
• Power supply
• AC power cord
The power supply has three light-emitting diodes (LEDs) that provide status information. These LED status indicators are
green and blue in color.
• Green represents AC OK or DC OK.
• Blue represents swap-mode power status.
Figure 7 shows the power supply LEDs. For more information on the behavior of the LEDs, see Power Supply LEDs.
Figure 7 Power Supply LEDs
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