IBM 2104 Model DU3 - Manual (Page 21)

Preparing the Rack (System or Expansion)
1. Find the two support rails ( 5 in Figure 1 on page 4) that are supplied with the
2104.
2. The 2104 Model DU3 is three Electronics Industries Association (EIA) units
high. Using the preinstallation planning information, or other relevant
information, determine where you are going to locate the 2104 Model DU3 in
the rack.
Notes:
v If you are installing the 2104 Model DU3 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 2104 Model DU3 into the rack, start at the
lowest available position, and work upward.
v You might need to remove the rack power distribution unit before you install
the support rails (see the Installation and Service Guide, or equivalent, for the
rack).
3. Refer to the EIA markings on the rack and decide where you are going to install
the support rails. If appropriate, allow for possible future installation of other disk
enclosures.
Installing a 2104 Model DU3 5