Xen、Citrix XenServer、XCP
XenXen is a hypervisor. It provides the fundamental isolation between virtual machines. Xen is open source (GPLv2) and is managed by Xen.org, an cross-industry organization. Xen is a component of many different products and projects. The hypervisor itself is verysimilar across all these projects, but the way that it is managed can be different, which can cause confusion if you're not clear which toolstack you are using. Make sure you know what toolstack you want before you get started.
Xen是一个开放源代码虚拟机监视程序（VMM），由剑桥大学开发。它是一种开源(GPLv2) 管理程序，现在已有 50 多家解决方案提供商为其提供支持。Xen 是一种可在 XenServer、Xen 云平台和 Oracle 虚拟机等其他发行版中使用的虚拟机管理程序。该虚拟机管理程序已由 Amazon Web 服务以及众多的 Web 托管服务和数据中心解决方案提供商使用。XEN 是一个基于X86架构、发展最快、性能最稳定、占用资源最少的开源虚拟化技术。Xen可以在一套物理硬件上安全的执行多个虚拟机，与Linux 是一个完美的开源组合，Novell SUSE Linux Enterprise Server 最先采用了XEN虚拟技术。Xen虚拟机可以在不停止的情况下在多个物理主机之间实时迁移。在操作过程中，虚拟机在没有停止工作的情况下内存被反复的复制到目标机器。虚拟机在最终目的地开始执行之前，会有一次60-300毫秒的非常短暂的暂停以执行最终的同步化，给人无缝迁移的感觉。类似的技术被用来暂停一台正在运行的虚拟机到磁盘，并切换到另外一台，第一台虚拟机在以后可以恢复。它特别适用于服务器应用整合，可有效节省运营成本，提高设备利用率，最大化利用数据中心的IT基础架构。
总的来说，Xen 是一个极小的程序，大约由 150,000 行代码组成，可创建一个用来管理来宾操作系统和系统资源的虚拟机管理程序，其管理方式与传统操作系统中的管理程序非常相似。
Citrix XenServer
Citrix XenServer is a commercial product. It is based on XCP, and exposes the same toolstack and managmentAPI. As an analogy, think of XenServer being based on XCP in the way that Red Hat Enterprise Linuxis based on Fedora. XenServer has a free version (which is very similar to XCP) and paid-for versionswith additional features enabled. XenServer is an “older” version of Xen with some features removed and other featurs hidden behind “add ons.” So XenServeris far less functional than Xen and is not completely free (it can be, but many features are not.) XenServer is a full suite with all of the nice console and tools, APIs, etc. Much more user friendly than Xen and requires no core OS knowledge to get it workingunlike Xen that requires you to really know the Dom0 environment well.
XenServer是商用产品。Xenserver之于XCP就像RHEL之于Fedora。Xserver是一个拥有完整的控制台、工具栈及API接口的套件。XenServer比Xen更容易使用，XenServer包含了Xen，linux以及一个主控制守护进程（xapi）。
Xen 云平台 (XCP)
XCP is a full virtualization suite based on Xen. It uses real Xen and combines in all of the other components needed to be a full suite justlike XenServer, vSphere and HyperV. It is open source and comes from the Xen people. Today, when people talk about Xen, they mostly talk about XCP as XCP is the apple to apple with the other products and not just the hypervisor. You lose no functionality goingwith XCP over Xen on its own but it is far easier. XCP is designed to be interoperable with most, if not all, APIs from XenServer so that they can share tools giving XCP a lot of important options.
2009 年，Xen.org 宣布启动 Xen 云平台 (XCP) 计划。根本而言，XCP 是 XenServer Free（免费版）的开源“对等物”，但是其中添加了部分仅 XenServer Advanced、Enterprise 和 Platinum 提供的功能（参见https://wiki.xenserver.org/XCP/XenServer_Feature_Matrix）
FeaturesXen Cloud PlatformXenServer FreeXenServer AdvancedXenServer EnterpriseXenServer PlatinumCost/LicensingFree/Open Source (Multiple Licenses1)Free/CitrixEULAPaid/CitrixEULAXenProject hypervisorXXXXXIntelliCacheXXXXXResilient distributed management architectureXXXXXVM disk snapshot and revertXXXXXXenCenter managementXXXXXConversion toolsXXXXXXenMotion® live MigrationXXXXXHeterogeneous poolsX
XXXDynamic Memory ControlX
XXXPerformance alerting and reportingX
XXXDistributed virtual switching management tool
XXXHigh availability
XXXAutomated VM protection and recoveryX
X 3X 3XHost power managementX
XXLive memory snapshot and revertX
XXRole-based administrationX
XXDynamic workload balancing
XXProvisioning services (virtual)
XXStorageLink
XXWeb self-service with delegated adminX 2
XXSite recoveryX
XLab manager with self-service portal
XProvisioning services (physical)
XXenServer features taken from the XenServerEditions page
LGPL, GPL, Q Public License v1 works flawless using original Virtual Appliance from Citrix (tested: XCP 1.5beta (1.4.90) and XenServer-wss-1.1.1.xva) Automated VM protection and recovery is only available for the Advanced and Enterprise editions in the 6.0 release and later.
xapi / XAPI / XenAPI
Both XenServer and XCP include Xen, Linux, and the primary control daemon known as xapi.
The API shared between XCP and XenServer is called "XenAPI". OpenStack usuallyrefers to XenAPI, to indicate that the integration works equally well on XCP and XenServer. Sometimes,a careless person will refer to XenServer specifically, but you can be reasonably confident that anythingthat works onXenServer will also work on the latest version of XCP.
http://onexin.iyunv.com/source/plugin/onexin_bigdata/https://wiki.openstack.org/w/images/a/aa/XenServer-dom0-domU.png
DescriptionXenXCPXCP-XAPI packages in LinuxHypervisorlatestlaggingas in latest Linux distroDom0 OSSee Dom0_Kernels_for_XenCentOS (5.7 in XCP 1.6)See Debian, Ubuntu and FedoraDom032 and 64 bits32 bits32 and 64 bitsLinux 3 PVOPS Dom0YesNoYesToolstackXM (deprecated), XL, libvirtXAPI with XESame as XCPFeaturesXen Feature ListXen Feature List and XCPFeature ListXen Feature List and XCPFeature ListStorage, Network, DriversBuild and get yourselfIntegrated with Open vSwitch, multiple storage types & driversGet them yourself (only core components are provided)ConfigurationsEverythingConstrained by XAPISame as XCPUsage ModelDo it yourselfShrink wrapped and testedDo it yourselfDistributionSource code or via hostLinux or Unix distributionsDelivered as ISO on xen.orgVia host Linux or Unix distributions
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