IBM ESS 3000 Hardware Planning And Installation Manual page 54

Figure 17. ESS 3000 system support rails
2. Working at the front of the rack cabinet, identify the two standard rack units (2U) of space in the rack
into which you want to install the support rails.
Figure 18 on page 42 shows two rack units with the front mounting holes identified.
Figure 18. Hole locations in the front of the rack
• 1 Upper rail-mounting bracket pin
• 2 Lower rail-mounting bracket pin
• 3 Rack mounting screw hole
3. Ensure that the appropriate bracket pins are installed in the front and rear bracket of each rail.
Each rail comes with four medium pins pre-installed (two in the front bracket and two in the rear
bracket). Large pins are provided separately. Use the pins that are appropriate for the mounting holes
in your rack (see Table 18 on page 43).
42 IBM Elastic Storage System 3000: Hardware Planning and Installation Guide