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b. Use a small screwdriver or the tip of a ball point pen to slide the Link Rate
switch to the left or right to set the desired fibre channel operating speed.
Attention: Although the Link Rate LED indicates the correct speed
setting, the link rate speed does not change until after you cycle power to
the storage subsystem.
6. Repeat step 1 on page 162 through step 5 on page 163 for all of the storage
subsystems in the configuration.
7. Perform the power-on sequence as described in “Turning on the storage
subsystem” on page 119.
8. Check the indicator lights on the front and back of all of the storage subsystem
and expansion drive modules. All the green indicator LEDs should be on, and
the amber indicator LEDs should be off. (No LEDs are displayed on blank
drives.)
9. Are only the green indicator LEDs on?
v Yes - The drive is working correctly.
v No - If an amber Fault indicator LED is on, go to 10.
10. Diagnose and correct the fault.
a. To run the Recovery Guru, select the Recovery Guru toolbar button in the
Subsystem Management window.
b. Complete the recovery procedure.
c. When the procedure is completed, rerun the Recovery Guru to ensure that
the problem has been corrected by selecting Recheck in the Recovery
Guru.
11. If the problem persists, contact IBM Customer and Technical Support.
Replacing an ac power supply and fan unit
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:
Disconnect the power cord before replacing the power supply and fan unit.
The power supply and fan unit is a component that includes both a 600-W power
supply unit and two fans. The power supply and fan units provide power and
cooling for the DS4700 Express. The power supply and fan units are customer
164 IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide