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132
IBM System Storage DS4200 Express Storage Subsystem: Installation, User's and Maintenance Guide
3. Label the fibre channel cables that are attached to the rear of the controllers.
Labeling the cables simplifies the re-cabling process.
4. Remove the fibre channel cables that are attached to the rear of the
controllers.
5. Remove both controllers. To remove them, complete the following steps:
a. Squeeze the controller latch and pull the lever open 90° (so that the lever
is horizontal) to release the controller from the latch. The controller latch is
a coral colored tab on the lever.
Note: The lever rotates upward or downward 90°, depending on whether
the controller you are removing is the right or left controller CRU.
b. Slowly pull the lever away from the storage subsystem chassis to remove
the controller from the controller bay, as shown in Figure 14 on page 34.
(You do not have to actually remove them from the controller bays.)
c. Repeat steps 5a and 5b for the other controller.
6. Remove both power supply and fan units. To remove them, complete the
following steps:
a. Squeeze the latch and pull the lever open 90° (so that the lever is
horizontal) to release the power supply and fan unit from the latch. The
latch is a coral colored tab on the lever.
b. Slowly pull the lever away from the chassis to remove the power supply
and fan unit, as shown in Figure 15 on page 35. (You do not have to
actually remove them from the power supply and fan unit bays.)
Note: The lever rotates upward or downward 90°, depending on whether
the power supply and fan unit you are removing is in the right or left
power supply and fan unit bay.
c. Repeat steps 6a and 6b for the other power supply and fan unit.
7. Label the EV-DDM CRUs so you know their physical location in the midplane.
8. Remove the EV-DDM CRUs. See "Removing an EV-DDM" on page 35 for
instructions.
Attention:
Do not stack EV-DDM CRUs on top of each other. Protect the
EV-DDM CRUs from vibrations or sudden shocks.
9. Use a #1 Phillips screwdriver to loosen the four front cage frame screws on
the midplane, as shown in Figure 80 on page 133.
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