Availability zones and regions are used for different purposes.
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Availability zones
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An availability zone is the fault domain of the SDDC. Multiple availability zone scan provide continuous availability of an SDDC, minimize unavailability of services and improve SLAs.
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Regions
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Regions provide disaster recovery across different SDDC instances. This design uses two regions. Each region is a separate SDDC instance. The regions have a similar physical layer design and virtual infrastructure design but different naming. For information on exceptions to this design, see the Business Continuity / Disaster Recovery Design chapter.
This design leverages a single availability zone for a one region deployment, and a single availability zone in each region in the case of a two region deployment.
The design uses the following regions. The region identifier uses United Nations Code for Trade and Transport Locations(UN/LOCODE) along with a numeric instance ID.
Region |
Region Identifier |
Region-specific Domain Name |
Region Description |
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A |
SFO01 |
sfo01.rainpole.local |
San Francisco, CA, USA based data center |
B |
LAX01 |
lax01.rainpole.local |
Los Angeles, CA, USA based data center |
Region Identifiers will vary based on the locations used in your deployment.
Decision ID |
Design Decision |
Design Justification |
Design Implication |
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SDDC-PHY-001 |
Per region, a single availability zone that can support all SDDC management components is deployed. |
A single availability zone can support all SDDC management and compute components for a region. You can later add another availability zone to extend and scale the management and compute capabilities of the SDDC. |
Results in limited redundancy of the overall solution. The single availability zone can become a single point of failure and prevent high-availability design solutions. |
SDDC-PHY-002 |
Use two regions. |
Supports the technical requirement of multi-region failover capability as outlined in the design objectives. |
Having multiple regions will require an increased solution footprint and associated costs. |