Virtual Machine Manager ProSynology Virtual Machine Manager Pro license allows you to fully utilize VMM’s cluster infrastructure. It enables migration and flexible scalability for load balancing and resource allocation. VMM is licensed by cluster size and offers various options to satisfy a variety of needs.Licensing PlanThere are 3-Node and 7-Node licenses for Virtual Machine Manager Pro (VMM Pro). You can create a VMM cluster with up to 7 Synology NAS. Each license enables VMM Pro features for a cluster within a one-year period. This license cannot be returned once activated.- Before purchasing this license, please check the compatibility of your Synology NAS with VMM.- This license can only be applied to one Synology VMM cluster at a time.- Purchased licenses can be migrated.