IBM NeXtScale System Planning And Implementation Manual

Contents

© Copyright IBM Corp. 2013, 2014. All rights reserved. 115Chapter 5. Rack planningA 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 asystem in terms of racks or multiple racks.In this chapter, we describe best practices for configuration of the individualracks. After the rack level design is established, we provide some guidance fordesigning 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 1465