Availability zones
Availability zones are used to group hypervisors within a single OpenStack region. Availability zones are exposed to the end user and should be used to provide the user with an indication of the underlying topology of the cloud. The most common use case for availability zones is to expose failure zones to the user.
To ensure the HA of a service deployed on OpenStack, a user will typically want to deploy the various components of their service onto hypervisors within different racks. This way, the failure of a top of rack switch or a PDU will only bring down a portion of the instances that provide the service. Racks form a natural boundary for availability zones for this reason. There are a few other interesting uses of ...
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