ComputeServiceContext context = iaasInfo.getComputeService().getContext();
AvailabilityZoneAndRegionApi zoneRegionApi = context.unwrapApi(AWSEC2Api.class).
getAvailabilityZoneAndRegionApiForRegion(region).get();
Set<AvailabilityZoneInfo> availabilityZones =
zoneRegionApi.describeAvailabilityZonesInRegion(region,
new DescribeAvailabilityZonesOptions[0]);
for (AvailabilityZoneInfo zoneInfo : availabilityZones) {
String configuredZone = zoneInfo.getZone();
if (zone.equalsIgnoreCase(configuredZone)) {
if (log.isDebugEnabled()) {