VMware
VMware contains a free version and 5 commercial versions together with their vSphere/ESXi product. It has innovative features like VMotion, Fault Tolerance, memory overcommitment, Storage vMotion and much more. VMware free version is referred to as “The VMware vSphere Hypervisor” that has features like graphical interface and memory over-commitment only. Other features like centralized management and vMotion are not provided. The free edition also only supports up to 32GB of RAM per physical server.
Microsoft Windows Server 2012 Hyper-V
Hyper- V is highly enhanced with Windows Server 2012. Hyper – V has a free version that did not have virtualization rights and GUI and 4 commercial versions which are Standard, Essentials, Foundation (OEM only) and Datacenter. It has features like dynamic memory, high availability, live migration, VM replication, storage migration and much more.
Red Hat Enterprise Virtualization (RHEV)
Red Hat Enterprise Virtualization (RHEV) offers an RHEL-based centralized management server that uses VDSM (Virtual Desktop Server Manager and SPICE protocol with a web-based interface (RHEV Manager) to manage virtual machines. The KVM hypervisor is used. It provides advanced features like a self-service user portal, support of up to 160 cores and 2 TB of RAM for Hosts, 64 vCPUs and 512 RAM for guests and much more.
XenServer
Citrix bought XenSource in 2007 and uses Xen in the commercial XenServer. It is an open-source project and community that is available at Xen.org. XenServer is available in 4 editions. It provides features like memory optimization, power management, conversion tools, high availability and others.
KVM
Kernel-Based Virtual Machine (KVM) can be installed on almost all the available Linux operating systems like SUSE and Ubuntu. It can support different operating systems like Windows, Linux and other custom OS. Users can use extra management tools like Red Hat’s Virtual Machine Manager to manage it.
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