Читать книгу CompTIA Cloud+ Study Guide - Ben Piper, David Higby Clinton - Страница 60

Another consideration involves the physical placement of your data center VMs. To ensure resiliency in the event of a virtualization host failure, organizations often use hypervisor affinity rules to ensure that redundant VMs never run on the same hardware. For example, you may have primary and secondary SQL database servers, each running on a different VM host. If the host running the primary SQL VM fails, the secondary VM running on a different host can take over. If both are running on the same host, then both VMs fail, defeating the point of redundant VMs in the first place!

Cloud providers offer the ability to enforce hypervisor affinity rules, although they may use more user-friendly terminology, such as VM-host affinity. As you plan a cloud migration, take note of VMs that are redundant or that appear to serve the same purpose. Chances are that you have hypervisor affinity rules in place that you'll want to re-create in the cloud.