code: public Observable<DisasterRecoveryConfigurationInner> getAsync(String resourceGroupName, String serverName, String disasterRecoveryConfigurationName) {
          return getWithServiceResponseAsync(resourceGroupName, serverName, disasterRecoveryConfigurationName).map(new Func1<ServiceResponse<DisasterRecoveryConfigurationInner>, DisasterRecoveryConfigurationInner>() {
              @Override
              public DisasterRecoveryConfigurationInner call(ServiceResponse<DisasterRecoveryConfigurationInner> response) {
                  return response.body();
              }
          });
      }
docs: Gets a disaster recovery configuration.
  
  @param resourceGroupName The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
  @param serverName The name of the server.
  @param disasterRecoveryConfigurationName The name of the disaster recovery configuration.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the DisasterRecoveryConfigurationInner object