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Powering off the storage subsystem
The DS4500 is designed to run continuously. After you turn it on, 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 138.
Turning off the storage subsystem
Use the following procedure to turn off the power for the DS4500. Figure 84 on
page 112 shows the location of the power switches on a storage subsystem.
Attention: Except in an emergency, never turn off the power if any Fault LEDs
are on. Correct the fault before you turn off the power. Use the DS4000 Storage
Manager client and the Fault LEDs to check the overall status of the DS4500. 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
DS4500 will power up correctly later.
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.
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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.
136 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide