虚拟化 Hypervisors 的分类

最新推荐文章于 2024-12-31 15:18:33 发布

转载最新推荐文章于 2024-12-31 15:18:33 发布 · 1.5k 阅读

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#虚拟化 #microsoft #vmware #resources #system #server

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本文探讨了虚拟化领域中一型与二型虚拟机监视器的区别。一型虚拟机监视器直接运行在硬件之上，为虚拟机提供资源；而二型虚拟机监视器则运行在一个宿主操作系统上，提供虚拟化服务。文章列举了一些典型的一型和二型虚拟机监视器实例，并讨论了微软Hyper-V在此分类中的位置。

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Type 1 and Type 2 Hypervisors

From: http://virtualizationreview.com/blogs/everyday-virtualization/2009/06/type-1-and-type-2-hypervisors-explained.aspx

In a recent discussion, the topic of Type 1 and Type 2 hypervisors came up. To some, this is an arbitrary distinction that doesn't matter much as there's already an inherent understanding of what the requirements are for a virtualization solution.

Simply put, the distinction between Type 1 and Type 2 has to do with whether an underlying operating system is present. Virtualization Review editor Keith Ward touched on part of this topic in a post about KVM virtualization in regards to Red Hat.

I'm convinced there's no formal standards-based definition of Type 1 and Type 2 criteria. However, I did like this very succinct piece of literature from IBM. While it doesn't have an exhaustive list of hypervisors and their types, it does give good definitions. The material describes a Type 1 hypervisor as running directly on the hardware with VM resources provided by the hypervisor. The IBM Systems Software Information Center material further states that a Type 2 hypervisor runs on a host operating system to provide virtualization services.

Some are obvious, such as VMware ESXi and Citrix XenServer being Type 1 hypervisors. My beloved Sun VirtualBox , VMware Server and Microsoft Virtual PC are all Type 2 hypervisors.

With that said, it's unclear where Hyper-V fits into the mix. Information like this Microsoft virtualization team blog post pull Hyper-V closer to the Windows Server 2008 base product.

The relevance of Type 1 and Type 2 distinction is academic, in my opinion, but something I wanted to share here. Your thoughts? Drop me a note or share a comment below .