Translations:Managing your cloud resources with OpenStack/72/en

Availability zones

Availability zones allow you to indicate what group of physical hardware you would like your VM to run on. On Beluga and Graham clouds, there is only one availability zone, nova, so there isn't any choice in the matter. However, on Arbutus there are three availability zones: Compute, Persistent_01, and Persistent_02. The Compute and Persistent zones only run compute or persistent flavors respectively (see Virtual machine flavors). Using two persistent zones can present an advantage; for example, two instances of a website can run in two different zones to ensure its continuous availability in the case where one of the sites goes down.