Procedure
1. Open the back doors of both racks that contain control units.
2. Turn o the circuit breakers in the following order:
a. Turn o the circuit breakers in both lower PDUs in both racks.
b. Turn o the circuit breakers in both upper PDUs in both racks with control
units.
3. Open the back doors of all racks containing only drive units and, in any order, turn
o the circuit breakers to all the PDUs.
Turning on power to the storage system after an emergency shutdown
To turn the power on to the storage system after an emergency shutdown, use the
following instructions.
Note: When turning on the storage system, rst turn on the PDUs connecting
to the drive trays and then turn on the PDUs connecting to the controllers.
Procedure
1. In all system racks, turn on the circuit breakers in the PDUs supplying electrical
power to the drive units.
2. In both controller racks, turn on the circuit breakers in the PDUs supplying electrical
power to the controllers.
3. Turn on power to the system. For more information, see Normal power On/O
procedures (on page 69) .
Turning on power to the storage system after an emergency shutdown
Chapter 4: Turning storage system power on and o
Hitachi Virtual Storage Platform 5000 Series Hardware Guide 71
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