# Hyper-V 给虚拟机换磁盘-centos 怎么开头呢，咱也不知道，先上图吧：  某实体服务器使用了 Hyper-V 作为基础虚拟化设施，其上运行若干虚拟机，其中有台虚拟机运行的是 Centos7 的系统，主要运行 web 服务器，刚开始给它分配了 服务器，刚开始给它分配了 100GB 的磁盘，后来在实际的使用过程中发现这台虚拟机用不了那么多的存储空间，所以想给它降一下配置，只分配 10GB 的磁盘。因为 Hyper-V 本身只能给虚拟机的虚拟磁盘扩容，不支持缩小，所以没别的办法，只能换一个虚拟磁盘，把原来的位于 100GB 磁盘上的 centos7 系统整体迁移到新的 10GB 的磁盘上。（这和给实体机的 centos7 系统换磁盘是差不多的步骤） 分区的卷名，因为磁盘变了，其分区的 uuid 也变了 7.为了系统能正常启动，要创建及复制几个文件，主要是受永久和永久性的预启动程序（固件）的影响 8. 退出 centos7 光盘的救援系统，然后在 hyper-v 里删除旧的 100G 磁盘（这个其实只是卸载磁盘，并不是删除真实的虚拟磁盘文件），还要把 centos7 的虚拟光驱也卸载了 9. 修改目标虚拟机的启动顺序，从新的磁盘启动，如无意外，可正常

VMware ESX $ ^{TM} $ 为什么是 — 而且将继续是一业界功能最强大且经过生产验证的虚拟化管理程序，为什么是比其他虚拟化管理程序更好的选择。 ## ESXi 和 Microsoft Hyper-V 的比较 作为业界第一款用于 x86 系统的 “裸机” 虚拟化管理程序，VMware ESX 是最可靠且功能最强大的虚拟化平台。VMware ESX 于 2001 年推出，现在已发展到第三代， 提升为更高级别的企业级虚拟化管理程序，能够进一步巩固我们的领先地位，并确保我们的客户获得无与伦比的性能和可靠性。 表 1. 各虚拟化管理程序的比较 |虚拟化管理程序属性|VMware ESX|Microsoft Hyper-V 1.0| |---|---|---| |占用磁盘空间小|✓32 MB 磁盘空间 (VMware ESXi)|✗必需的 Server Core 模式安装需 2.6 GB 磁盘空间| |独立于操作系统|✓无控制台操作系统 半虚拟化|✗没有 AMD-RVI，没有大型内存页面，仅在 Windows 2008 虚拟机上支持 4 路 vSMP| |虚拟化安全技术|✓VMware VMsafe™ 安全 API|✗没有同类技术| ## Hyper-V、Xen 和 KVM：代码太多 就虚拟化而言，越小越好。虚拟化占用的空间越小，外部威胁的攻击面就越小，因此可以极大地降低所需的补丁程序的数量，而这不仅可以提高产品的可靠性，而且还能提高数据中心的稳定性。

9.28.4 Decrypting Encrypted Images ..... 293 9.29 Paravirtualized Debugging ..... 293 9.29.1 Hyper-V Debug Options ..... 293 9.30 PC Speaker Passthrough ..... 296 9.31 Accessing USB devices Exposed USB/IP Support on a Linux System ..... 297 9.31.2 Security Considerations ..... 298 9.32 Using Hyper-V with Oracle VM VirtualBox ..... 298 9.33 Nested Virtualization ..... 299 9.34 VISO file format key-value pairs separated by commas. An empty string disables paravirtualized debugging. #### 9.29.1 Hyper-V Debug Options All of the options listed below are optional, and thus the default value specified

9.28.4 Decrypting Encrypted Images ..... 293 9.29 Paravirtualized Debugging ..... 293 9.29.1 Hyper-V Debug Options ..... 293 9.30 PC Speaker Passthrough ..... 296 9.31 Accessing USB devices Exposed USB/IP Support on a Linux System ..... 297 9.31.2 Security Considerations ..... 298 9.32 Using Hyper-V with Oracle VM VirtualBox ..... 298 9.33 Nested Virtualization ..... 299 9.34 VISO file format key-value pairs separated by commas. An empty string disables paravirtualized debugging. #### 9.29.1 Hyper-V Debug Options All of the options listed below are optional, and thus the default value specified

9.28.4 Decrypting Encrypted Images ..... 293 9.29 Paravirtualized Debugging ..... 293 9.29.1 Hyper-V Debug Options ..... 293 9.30 PC Speaker Passthrough ..... 296 9.31 Accessing USB devices Exposed USB/IP Support on a Linux System ..... 297 9.31.2 Security Considerations ..... 298 9.32 Using Hyper-V with Oracle VM VirtualBox ..... 298 9.33 Nested Virtualization ..... 299 9.34 VISO file format key-value pairs separated by commas. An empty string disables paravirtualized debugging. #### 9.29.1 Hyper-V Debug Options All of the options listed below are optional, and thus the default value specified

9.28.4 Decrypting Encrypted Images ..... 293 9.29 Paravirtualized Debugging ..... 293 9.29.1 Hyper-V Debug Options ..... 293 9.30 PC Speaker Passthrough ..... 296 9.31 Accessing USB devices Exposed USB/IP Support on a Linux System ..... 297 9.31.2 Security Considerations ..... 298 9.32 Using Hyper-V with Oracle VM VirtualBox ..... 298 9.33 Nested Virtualization ..... 299 9.34 VISO file format key-value pairs separated by commas. An empty string disables paravirtualized debugging. #### 9.29.1 Hyper-V Debug Options All of the options listed below are optional, and thus the default value specified

9.28.4 Decrypting Encrypted Images ..... 293 9.29 Paravirtualized Debugging ..... 293 9.29.1 Hyper-V Debug Options ..... 293 9.30 PC Speaker Passthrough ..... 296 9.31 Accessing USB devices Exposed USB/IP Support on a Linux System ..... 297 9.31.2 Security Considerations ..... 298 9.32 Using Hyper-V with Oracle VM VirtualBox ..... 298 9.33 Nested Virtualization ..... 299 9.34 VISO file format key-value pairs separated by commas. An empty string disables paravirtualized debugging. #### 9.29.1 Hyper-V Debug Options All of the options listed below are optional, and thus the default value specified

9.28.4 Decrypting Encrypted Images ..... 292 9.29 Paravirtualized Debugging ..... 292 9.29.1 Hyper-V Debug Options ..... 292 9.30 PC Speaker Passthrough ..... 295 9.31 Accessing USB devices Exposed USB/IP Support on a Linux System ..... 296 9.31.2 Security Considerations ..... 297 9.32 Using Hyper-V with Oracle VM VirtualBox ..... 297 9.33 Nested Virtualization ..... 298 9.34 VISO file format key-value pairs separated by commas. An empty string disables paravirtualized debugging. #### 9.29.1 Hyper-V Debug Options All of the options listed below are optional, and thus the default value specified

9.28.4 Decrypting Encrypted Images ..... 293 9.29 Paravirtualized Debugging ..... 293 9.29.1 Hyper-V Debug Options ..... 293 9.30 PC Speaker Passthrough ..... 296 9.31 Accessing USB devices Exposed USB/IP Support on a Linux System ..... 297 9.31.2 Security Considerations ..... 298 9.32 Using Hyper-V with Oracle VM VirtualBox ..... 298 9.33 Nested Virtualization ..... 299 9.34 VISO file format key-value pairs separated by commas. An empty string disables paravirtualized debugging. #### 9.29.1 Hyper-V Debug Options All of the options listed below are optional, and thus the default value specified

9.28.4 Decrypting Encrypted Images ..... 292 9.29 Paravirtualized Debugging ..... 292 9.29.1 Hyper-V Debug Options ..... 292 9.30 PC Speaker Passthrough ..... 295 9.31 Accessing USB devices Exposed USB/IP Support on a Linux System ..... 296 9.31.2 Security Considerations ..... 297 9.32 Using Hyper-V with Oracle VM VirtualBox ..... 297 9.33 Nested Virtualization ..... 298 9.34 VISO file format key-value pairs separated by commas. An empty string disables paravirtualized debugging. #### 9.29.1 Hyper-V Debug Options All of the options listed below are optional, and thus the default value specified