Linux和虚拟技术

2006年的IT世界除了双核等热门话题之外，虚拟技术也是一个不容忽视的热点。最早使用VMWare是在2001年，算是比较早的接触虚拟技术的了。一直没有意识到虚拟技术的真正意义，直到如今，才开始关注以Xen为代表的新兴的Linux虚拟技术。

超虚拟和完全虚拟
大部分人提到虚拟化技术时，指的是完全虚拟技术，完全在操作系统层面模拟硬件的机制，这种技术的典型代表就是VMware, QEMU, and Bochs。

完全虚拟就是的优缺点是明显的，完全的硬件仿真环境和近乎完全真实的运行结果是它的主要优点，缺点则是对于硬件资源的消耗也是巨大的，完成完整的硬件仿真所耗费的资源的代价有时候是得不偿失的。

最近几年流行的一种技术叫做超虚拟化，超虚拟化技术的特点是虚拟机运行在一个虚拟机监视环境中（VMM），通过软件接口访问需要的系统资源服务。超虚拟一般被认为是一种技术上的回归，回归到IBM主机时代的虚拟技术。在linux平台上，超虚拟化的典型软件有Xen，Linux-Vserver，UML（User mode linux）和最新的KVM（Kenerl Virtual Module）等。

超虚拟化技术对于现在快速发展的过剩硬件处理能力是一种不可低估的技术。

IBM DW上的文章虚拟Linux很好的总结了Linux虚拟技术的一些问题和概念；
关于Linux虚拟化技术的应用，需要更多的实践来收集相关信息！！

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