[secabeen]

This isn't a huge one, but we're a VMWare shop, and you can only VMotion (move live machines) VMs between server on the same chip class or lower. When we had a mix of AMD and Intel servers, we had to put them in different clusters, and could only migrate between clusters when the VM was powered-off.

[wstuartcl]

You can, however simply power down the vm and then use vmotion to migrate across from intel to amd. Not "live" but pretty close to it when migrating to the new cpu cluster.

[secabeen]

Yes, but depending on your architecture, that may result in a service outage or degradation. It's really nice to be able to VMotion live machines without any impact to users.

Sure, Devops, durable machines, chaos monkey, etc. etc.; we don't develop all of the code our users run, and not all of it has those features yet, or will ever.