You want seamless virtual machine migration with fault tolerance? Try Windows Server Failover Clustering.

We have Hyper-V implemented as our primary hypervisor and we have also implemented failover clustering with cluster storage and multipath IO to mitigate node failure without impacting our work loads, in case of cluster node failure it seamlessly migrates workloads to other hypervisors without any downtime, the other benefit is that when we are updating hypervisors we live migrate virtual machines to different nodes in same cluster and restart one by one that results in no downtime and hassle free operation. it simply made management of virtual machines simpler and improved overall uptime of our infrastructure.