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Multiple availability zones can be created to manage Block Storage storage hosts. Edit the /etc/openstack_deploy/openstack_user_config.yml and /etc/openstack_deploy/user_variables.yml files to set up availability zones.
For each cinder storage host, configure the availability zone under the container_vars stanza:
cinder_storage_availability_zone: CINDERAZ
Replace CINDERAZ with a suitable name. For example cinderAZ_2
If more than one availability zone is created, configure the default availability zone for all the hosts by creating a cinder_default_availability_zone in your /etc/openstack_deploy/user_variables.yml
cinder_default_availability_zone: CINDERAZ_DEFAULT
Replace CINDERAZ_DEFAULT with a suitable name. For example, cinderAZ_1. The default availability zone should be the same for all cinder hosts.
If the cinder_default_availability_zone is not defined, the default variable will be used (nova). This could make horizon’s volume creation fail.