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Amazon EC2 provides the ability to place instances in multiple locations. Amazon EC2 locations are composed of Availability Zones and Regions. Regions are dispersed and located in separate geographic areas (US, EU, etc.). Each Region is completely independent.

By launching instances in separate Regions, you can design your application to be closer to specific customers or to meet legal or other requirements.

If a region is unavailable, then users to that region will not be able to access the server instances launched in that region. This may, in turn, adversely impact the user experience with the cloud. To avoid such an unpleasant outcome, it is best to periodically monitor the availability of each region, so that unavailable regions can be quickly and accurately identified, and the reasons for their non-availability remedied.

This test performs periodic availability checks on each region on the cloud, and reports the status of the individual regions. In addition, the test also indicates the time taken for connecting to a region so that, regions with connectivity issues can be isolated.

Measurement	Description	Measurement Unit	Interpretation
Availability	Indicates whether/not this region is currently available.	Number	A value 0 indicates that the Region is Not Available and the value 100 indicates that the Region is Available.
Response_time	Indicates the time taken to connect to this region.	Secs	A low value is typically desired for this measure. A high value or a consistent increase in this value could be indicative of connection bottlenecks. Compare the value of this measure across regions to know which region takes the longest to connect to.