Red Hat OpenStack Services on OpenShift distributed zones (DZ) architecture isolates storage across autonomous failure domains to ensure business continuity. The design places one dedicated storage backend per zone for Glance (image management), Cinder (block storage), and Manila (file storage). Glance uses multi-stores with dedicated per-zone API endpoints to enforce locality. Cinder volume services are pinned to their respective zone backends, while stateless API services spread evenly. Manila follows the same pattern, with share services zone-pinned and cross-zone share access supported by design. The architecture supports up to 15ms RTT between zones and is GA for Red Hat Ceph Storage and certified third-party vendors.
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