5. Change the link rate switch setting by doing the following:
a. Put on anti-static protection.
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 141 through step 5 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 97.
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 are lit, and the
amber indicator LEDs are 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 make sure
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.
Link Rate sw itch
(2 Gbps or 4 Gbps)
Figure 84. Link rate switch
142 IBM System Storage DS5020 Storage Subsystem: Installation, User’s, and Maintenance Guide
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