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Learning Ceph - Second Edition by Karan Singh, Vaibhav Bhembre, Anthony D'Atri

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Rack strategy

Rack and stack strategies and policies vary across organizations and even among datacenters (DCs) within a given organization. In this section, we'll explore considerations for placing your Ceph servers, especially as regards to failure domains, a topic that we'll discuss in greater detail in Chapter 8, Ceph Architecture: Under the Hood.

Small to modest Ceph clusters may not comprise enough servers to fill multiple datacenter racks, especially with today's dense 1U and 2U chassis. For these there are two classes of layout strategies:

  1. Place everything within a single rack
  2. Spread the servers over multiple racks

Single rack deployments offer simplicity: networking can be fulfilled with fewer switches and you never have to think ...

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