Introduction to Xen, OpenVZ, KVM, Hyper-V, VMWare virtualization technologies
I. Xen Developed by the University of Cambridge, Xen is fully partitioned based on hardware and can only allocate as many resources as are physically available, making it difficult to oversell. It can be divided into Xen-PV (paravirtualization), and Xen-HVM (full virtualization). Memory and hard disk space cannot be oversold by Xen. When the parent server has only 16G memory and 100G hard disk, the Xen architecture (any virtualization) will directly occupy 1G memory and 25G hard disk of the server, so the performance of Xen is better than OpenVZ in the case of overselling. Xen-PV: it is only applicable to Linux series VPS, but it has a lower performance loss, about 4% to 8% when compared to the parent machine. Xen-HVM: You can install Windows or freely mount ISO files to install any system, but because it is fully virtualized, the performance loss is greater, ranging from 8% to 20% compared to the parent machine. Applicable people: Customers who have a more adequate budget ...