Determining Where To Attach The Slide Rail In The Rack; Figure 1-15 Mounting Hole Pattern Of Rack Vertical Rails - Silicon Graphics Origin 350 User Manual

Determining Where to Attach the Slide Rail in the Rack

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The module requires two units (2U) of space within the rack (one unit is equivalent to
1.75 inches [44.5 cm]). To determine where you should install the slide rails in the rack,
you must count mounting holes. Each U contains three mounting holes; therefore, in the
2U of space that the module occupies, there are six mounting holes. The bottom hole of
the 2U space is hole 1. The top mounting hole in the 2U space is hole 6. See Figure 1-15.
Note: A module in the rack is identified by the lowest U number that it occupies. For
example, in Figure 1-15 the module resides in U5 (the fifth unit within the rack).
8
7
6
5th hole
5
2nd hole
6th hole
4
3
1st hole
2
1
Figure 1-15 Mounting Hole Pattern of Rack Vertical Rails
To determine how many mounting holes you must count, use the following formula:
3 x (the lowest U number that the module will occupy) - 2. For example, when you
want to install the module in locations U9 and U10, count 25 mounting holes (3 x 9 - 2)
starting from the bottom of the rack. The 25th hole is the first mounting hole of U9.
Installing the Server System in a Rack
8
7
6
5
4
3
2
1
2U
2U
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