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Home > APEX > Storage > White Papers > Performance Results for Dell APEX Block Storage for AWS > Testing narrative
The cluster rebuild test demonstrates the resiliency of APEX Block Storage for AWS in a single AZ deployment and multi-AZ deployments. The test shows the time it takes to fully rebuild (re-protect) data after an outage. The definition of an outage for a single AZ deployment is the unavailability of a single storage instance (SDS). The definition of an outage in a multi-AZ deployment is the unavailability of the storage instances in one AZ.
The two test scenarios were as follows for both instance types.