IBM DS4800 - Turning off the Storage Subsystem

Turning off the storage subsystem
Attention: Except in an emergency, never turn off the power if any storage
subsystem 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 storage subsystem and its components. 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 (see “Monitoring status
through software” on page 107). This ensures that the storage subsystem will
power up correctly later.
The storage subsystem is designed to run continuously, 24 hours a day. After you
turn on the storage subsystem, do not turn it off except in the following situations:
v Instructions in a hardware or software procedure require you to turn off the
power.
v A service technician tells you to turn off the power.
v A planned power outage or emergency situation occurs (see “Performing an
emergency shutdown” on page 103).
Statement 5:
CAUTION:
The power control button on the device and 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.
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Attention: Turning off and turning on power without waiting for the storage
expansion enclosure disk drives to spin down can damage the drives and might
cause data loss. Always let at least 70 seconds elapse from when you turn off the
power until you turn on the power again.
100 IBM System Storage DS4800 Storage Subsystem: Installation, User’s, and Maintenance Guide