The VMs are _probably using local disk storage, thus live migrations would be non-trivial to achieve and may be impossible given their current setup. From memo

The VMs are _probably using local disk storage, thus live migrations would be non-trivial to achieve and may be impossible given their current setup. From memory[1], you had to be migrating between the same architecture, and if they're anything like the smaller providers they're running less bigger nodes, and thus it's actually a lot quicker to just push the power button. [1] I worked with Xen years ago, my information is no doubt out of date.