The cluster is a logical grouping of one or more Oracle Linux Kernel-based Virtual Machine (KVM) hosts on which several VMs can run. KVM hosts in a cluster must share the same storage domains and need to have the same CPU type (either Intel or AMD). Each cluster belongs to a data center and each KVM host belongs to a cluster.
Virtual machines are dynamically allocated to any KVM host in the cluster and can be migrated between them. Even when one of the hosts are unavailable, the virtual machine can be started in any available host.