We have a bit odd setup where some of our clients have dedicated hosts and we also have some shared hosts. We can migrate client VMs from their dedicated host to shared host if we need ot do some maintenance. We don't have shared storage and currently we are using XenServer which supports live migration without shared storage. We recently started looking into KVM as an alternative and decided to try ovirt. To our surprise KVM supports live migration without shared storage but ovirt does not. (https://hgj.hu/live-migrating-a-virtual-machine-with-libvirt-without-a-shared-storage/)