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(3) Turning off AC power
Turn off the powers of the additional disk enclosure and disk array unit in the
following procedure.
a) Turn off the host system or FC-AL switch, and then perform the procedure
explained in "(2) Notes on AC power-off".
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 additional disk enclosure 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 the two power switches at the rear of the
disk enclosure.
Be careful that data may be lost if you turn off the disk enclosures before the
array controller.