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v Instructions in a hardware or software procedure require that you turn off the
power.
v An IBM technical support representative instructs you to turn off the power.
v A power outage or emergency situation occurs, see “Restoring power after an
unexpected shutdown” on page 137.
Turning off the storage subsystem
Use the following procedure to turn off the power for the DS4700 Express.
Attention: Except in an emergency, never turn off the power if any Needs
Attention LEDs are on. Correct the fault before you turn off the power. Use the
DS4000 Storage Manager client and the Needs Attention LEDs to check the overall
status of the DS4700 Express. All LEDs should be green on the front of the storage
subsystem. If they are not, use the DS4000 Storage Manager client to diagnose the
problem. This ensures that the DS4700 Express will power up correctly later.
The DS4700 Express is designed to run continuously. After you turn on the DS4700
Express, do not turn it off. Turn off the power only in the following situations:
v Instructions in a hardware or software procedure require that you turn off the
power.
v An IBM technical support representative instructs you to turn off the power.
v A power outage or emergency situation occurs, see “Restoring power after an
unexpected shutdown” on page 137.
Statement 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.
1
2
CAUTION:
This unit has more than one power source. To remove all power from the unit,
all dc MAINS must be disconnected.
134 IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide