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Turning off the power
5
CAUTION:
The Power Control button on the device and the power switch on the power supply
do not turn off the electrical current supplied to the device. The device also might
have more than one power cord. To remove all electrical current from the device,
ensure that all power cords are disconnected from the power source.
Attention: The controller unit is designed to run continuously, 24 hours a day. Except in
an emergency, never turn off the power if any controller unit fault indicator
lights are lit. Use the proper troubleshooting or servicing procedure to correct
the fault before turning off the power. This ensures that the controller unit
powers up correctly later. For more information, see
lights" on page
Use the following procedure to turn off power to the controller unit.
1 Prepare the controller unit for shutdown, as follows:
a Stop all I/O activity to the controller unit and attached drive enclosures. Logically
disconnect the controller and drive enclosures from the hosts. Make sure that the
fast write cache indicator light on each controller unit front panel and all applicable
drive active indicator lights on each drive enclosure front panel are off (not
blinking).
Note:If a parity check is in progress, it can take a long time for the drive indicator
lights to stop blinking.
b Make sure that all amber fault indicator lights on the controller unit are off. If any
fault indicator lights are on, correct the problem before turning off the power. For
more information, see
15.
"Checking the indicator lights" on page
"Checking the indicator
15.
Chapter 2. Operating the controller unit
13
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