Live Migration Internals and Optimization
Memory Pre-Copy, RDMA Offload, and What Affects Migration Time
Live migration is the capability that makes Hyper-V clustering genuinely useful. Without it, maintenance means VM downtime. With it, VMs move between hosts transparently , users don’t notice, applications don’t interrupt, connections don’t drop. But “it works” isn’t enough for production. You need to understand how it works, what affects performance, and what Windows Server 2025 changed.
VMware admins know this as vMotion. The Hyper-V equivalent is functionally identical , the VM moves from one host to another while running , but the internal mechanics differ, and the WS2025 improvements are significant.