Turning off the storage subsystem
Attention: Except in an emergency, never turn off the power if any storage
subsystem’s 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 115). 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 111).
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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2
Attention: Turning the power off and on without waiting for the storage expansion
enclosure disk drives to spin down, can damage the drives and might cause data
loss. Wait at least 70 seconds after turning the power off before turning it on, again.
108 IBM System Storage DS4800 Storage Subsystem: Installation, User’s, and Maintenance Guide
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