4.The rack-mounted unit is three EIA units high. Decide accordingly where you are going to install the support rails.

Attention: Use the rack mounting template provided in Figure 18 on page 37 and Figure 19 on page 38 to locate the proper rack mounting holes for installing the support rails into the rack.

Note the following considerations before you choose where to install the rails:

vIf you are installing the DS4700 Express into an empty rack, install it into the lowest available position so that the rack does not become unstable.

vIf you are installing more than one DS4700 Express in the rack, start at the lowest available position, and work upward.

vIf appropriate, allow for possible later installation of other units.

vIf necessary, remove the rack power distribution unit before you install the support rails.

vFor procedures and more information, refer to the installation and service guide, or equivalent, for the rack.

vThe lip on the rail should line up with the bottom of the storage subsystem (the 0U boundary in Figure 19 on page 38).

5.Using a #2 Phillips screwdriver, loosen the two screws on the left support rail that hold the two parts of the rail together (5).

Note: The support rails are not marked as left or right. However, each rail can be correctly mounted on only one side of the rack cabinet. The rails should be mounted with the alignment pins at the back of the rack. Figure 20 on page 40 shows the installation of the left support rail.

6.Hold the back of the rail against the inside of the rack-mounting flange. Make sure the rail mounting guide pins are in the correct holes. See Figure 19 on page 38 for an illustration.

7.Using the 5/16 (8 mm) hex nut driver, securely tighten the two M5 screws (2).

Note: Make sure you use a washer when installing an M5 screw through a square hole on the rack-mounting flange.

8.Extend the rail to the front of the rack until it makes contact with the front rack-mounting flange (3).

9.Securely tighten the M5 screws (1).

Note: Be sure to install the screw labeled install first in Figure 18 on page 37.

10.Securely tighten the two screws on the left support rail that hold the two parts of the rail together (5).

11.Repeat step 5 through step 10 for the right support rail.

Note: Because the mounting holes on the rack are not always the same size as the mounting screws, the lip (6) of each of the support rails may not line up evenly. Make minor adjustments as needed to ensure that the lip of the left and right support rails are lined up evenly on the racks. Failure to do so will cause the storage subsystem to fit unevenly in the rack.

Chapter 2. Installing the storage subsystem 39

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IBM DS4700 manual Installing the storage subsystem