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(3) Turning off AC power
a)
Turn off the host system or FC-AL switch, and then perform the procedure
explained in "(2) Notes on AC power-off" before turning off the power.
b)
After finishing the operation in a, turn off the array controller and then all the
disk enclosures including additional disk enclosures. Alternatively, turn off
the array controller and all the disk enclosures including additional disk
enclosures connected with the array controller at the same time.
The disk array unit has the redundant power configuration to prevent the entire
unit from shutting down due to a single failure. Therefore, when turning off
the disk array unit, turn off all the power switches (of the array controller and
disk enclosures) at the rear of the unit.
Be careful that data may be lost if you turn off the disk enclosures before the
array controller.
[Power-off procedure]
Turn off the power switches in the following order (1) to (5):
(5) Power switches of disk enclosures
(May be turned off at the same time the power
switches of array controller are turned off.)
(4) Power switches of array controller
(2) (3) Shut down switches
83
(1) Host system
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