Emergency Power Off/On Procedures; Turning Off Power To The Storage System During An Emergency - Hitachi G1500 Hardware Manual

Caution: Except in an emergency, do not turn off the PDU breakers before
turning off the power to the system. The system reacts as a power failure
occurred and uses the cache backup batteries to keep the cache active until
the data in the cache is transferred to the cache backup flash memory. When
the cache backup batteries discharge power, the power-on time can be
prolonged by the amount of charge remaining in the batteries. Fully
discharged batteries take 90 minutes to charge.
Note: The control panel includes a safety feature to prevent the storage
system power from being turned on or off accidentally. The PS power ON/OFF
switch does not work unless the ENABLE switch is moved to and held in
ENABLE while the power switch is moved to ON or OFF.
Procedure
1. In the PS area on the control panel, move the ENABLE switch to the ENABLED and
hold it there. While holding the switch in ENABLED, move the PS ON/OFF switch to
OFF. Then release both switches.
2. Wait for the storage system to complete its shutdown routines. Depending on the
storage system configuration and certain MODE settings, you can wait 20 minutes
for the storage system to copy data from the cache to the cache flash drives and for
the disk drives to spin down.
If the READY and PS LEDs do not turn OFF after 20 minutes, contact customer
support for assistance.

Emergency power off/on procedures

The following describes how to shut off the system during an emergency situation and
turning on power to the storage system after an emergency shutdown.

Turning off power to the storage system during an emergency

The storage system does not have an emergency power off switch. Use the following
procedure to turn off the system during an emergency.
Note: When turning off the storage system, first turn off the PDUs connecting
to the controllers and then turn off the PDUs connecting to the drive trays.
Procedure
1. Open the back doors of both racks that contain control units.
2. Turn off the circuit breakers in the following order:
a. Turn off the circuit breakers in both lower PDUs in both racks.
b. Turn off 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
off the circuit breakers to all the PDUs.
Chapter 6: Turning power on and off to the storage systems
Hitachi Virtual Storage Platform G1000, G1500, and VSP F1500 Hardware Guide
Emergency power off/on procedures
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