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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:
v If 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.
v If you are installing more than one DS4700 Express in the rack, start at the
lowest available position, and work upward.
v If appropriate, allow for possible later installation of other units.
v If necessary, remove the rack power distribution unit before you install the
support rails.
v For procedures and more information, refer to the installation and service
guide, or equivalent, for the rack.
v The 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