© Copyright IBM Corp. 2013, 2014. All rights reserved. 115
Chapter 5. Rack planning
A NeXtScale System configuration can consist of many chassis, nodes, switches,
cables, and racks. In many cases, it is relevant for planning purposes to think of a
system in terms of racks or multiple racks.
In this chapter, we describe best practices for configuration of the individual
racks. After the rack level design is established, we provide some guidance for
designing multiple rack solutions.
This chapter includes the following topics:
5.1, “Power planning”
5.2, “Cooling” on page 122
5.3, “Density” on page 124
5.4, “Racks” on page 125
5.5, “Rear Door Heat Exchanger” on page 141
5.6, “Top of rack switches” on page 143
5.7, “Rack-level networking: Sample configurations” on page 146
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