When you're creating new Rackspace cloud resources it's important to understand what a region is and how to use regions effectively.
What is a Region?
A region is a collection of one or more data centers with a low latency, high bandwidth network interconnecting them. A region can be viewed as a "logical data center" and is designated by the nearest major airport code (like DFW for Dallas/Forth Worth, or LON for London).
The following is a list of available Rackspace regions:
- Dallas-Fort Worth (DFW)
- Chicago (ORD)
- Northern Virginia (IAD)
- London (LON)
- Sydney (SYD)
- Hong Kong (HKG)
More information about our data centers can be found on our Global Infrastructure page.
Note: Because First Generation and Next Generations servers have different architectures, they're not considered to be in the same region, even if they are in the same datacenter. For example, a First Generation Cloud Server and Next Generation Cloud Server that are both located in the DFW datacenter are not in the same region.
Not all cloud services are available in all regions.
The provisioning of cloud services may also be restricted in some regions in which they are normally available due to maintenance or capacity concerns. Contact Support to request access to a restricted region.
Note: At this time, the provisioning of cloud services in the ORD region is not available to new customers. If you are a new customer, you may open a ticket in the Cloud Control Panel to add ORD to your account, pending approval.
Benefits of Using Regions
Whenever possible, consider locating your Rackspace infrastructure in the same region to receive the following benefits:
Geographic choice. You can provision resources closer to your end users or other applications, data centers, clouds, etc. This becomes increasingly important with hybrid on-premises to public cloud scenarios.
Network performance. All resources provisioned within a region have internal connectivity over a private, low latentcy, high bandwidth network. The physical distance between resources is small and improves the speed of network traffic and throughput.
Free bandwidth. All communication over the Rackspace Network (aka ServiceNet) within the same region is free.
About Free Bandwidth
The example explains how to avoid bandwidth charges for communication between resoruces in the same region.
Let's say you're going to set up a new Cloud Load Balancer that will service two Cloud Servers currently running in the Dallas region. When you create the new load balancer, choose the same region as your servers, in this Dallas (DFW) region. There will be no bandwidth charges for the communications between the servers and load balancers in this region. Note that if later added a Cloud Server running in the Chicago region to the load balancer in Dallas, normal bandwith charges would be incurred for traffic between the server in Chicago and the load balancer in Dallas.
The diagram below provides a visual representation of this concept:
This concept applies to all Rackspace cloud infrastructure that allows you to select a region when you create the resource. In most cases, you should create your resources in the same region to keep the resource close to end-users and other infrastructure, for increased network performance, and to avoid internal bandwidth charges.
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