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
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.
2 
1 
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
164IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide
