Availability zones and regions are used for different purposes.

Availability zones

An availability zone is the fault domain of the SDDC. Multiple availability zone scans provide continuous availability of an SDDC, minimize the unavailability of services, and improve SLAs. This design uses a single availability zone.


Regions provide disaster recovery across different SDDC instances. This design uses a single region.

The design uses the following region. Region identifiers uses United Nations Code for Trade and Transport Locations (UN/LOCODE) along with a numeric instance ID.


Region Identifier

Region-specific Domain Name

Region Description




San Francisco, CA, USA based data center


Region Identifiers will vary based on the locations used in your deployment.

Table 1. Availability Zones and Regions Design Decisions

Decision ID

Design Decision

Design Justification

Design Implication


Use a single region.

Supports the reduced footprint requested for use in a consolidated SDDC.

Results in dual region being limited to backup/restore as there is no additional region to fail over to.


Deploy a single availability zone that can support all SDDC management components and compute workloads.

A single availability zone can support all SDDC management and compute components for a region.

The single availability zone can become a single point of failure and prevent high-availability design solutions.

Results in limited redundancy of the overall solution.