Cross-cloud alignment bottlenecks

If you’re running different parts of the application under test in different cloud vendor environments, you need to consider cross-cloud alignment bottlenecks and the latency that they bring. You need to be able to align web services and align latencies.

Alignment is particularly important when you’re looking at a web service or application server that is running a web service that is talking to a database service that may be in the same cloud or a different cloud. If the database layer in the cloud has to make extra round trips to collect data sets, you’re going to encounter the associated costs. In on-premises testing, you can take the database layer for granted. That’s not the case with the cloud. And keep in mind that when you make calls that jump across cloud vendors, you might end up paying double for throughput—because you’re paying for cloud-in at one vendor and cloud-out at another vendor. Cloud-to-cloud communication can actually be very costly.