Virtual Desktop Infrastructure (VDI) 简介
VMware Infrastructure 3 Server (VI3)
Virtualized Remote Desktop Host
3rd Party Connection Broker （就是类似微软的远程连接桌面，）
Thin Client Computer
Advantages of VDI
Reduced cost in purchasing desktop computers, as thin clients often last two to three times longer than a desktop computer
Centralized Client OS Management
Rapid Client Deployment
Reduction in desktop support costs
Reduction in electricity costs, as thin client computers use only a fraction of amount of energy that is used by a desktop computer.
Improved Data Security
Secure Remote Access, as most connection brokers offer an SSL VPN Component and Web Portal
Compliance with HIPAA and Sarbanes Oxley (SOX)
Fewer Application Compatibility Problems than with Terminal Server and Citrix, as users have their own, single user OS.
Disadvantages of VDI
Many items that are problematic in Terminal Server and Citrix environments exist in VDI, i.e.:
Printing often requires a 3rd party add-on （打印需要第3方支持）
PDA Sync not supported（pda同步有问题）
Scanning is not natively supported（扫描仪有问题）
Bi-Directional Audio is not natively supported（声卡会有问题）
Display protocols not suitable for Graphics Design（没看懂）
Requires low-latency connection between the client and virtual infrastructure（连接需要时间，有延迟）
Requires Enterprise Class Server Hardware and Storage Area Network（需要企业级别的存储）
For VMs permanently assigned to specific users, these machines need to be patched just like a physical client computer.
Requires IT Staff skilled with VMware and terminal server. These are usually different staff, as the people using VMware are historically using it for consolidating servers, whereas those skilled with terminal server or Citrix are used to dealing with end user applications and devices. Although talk of VDI does not typically mention terminal server, every XP Pro or Vista Remote Desktop Host is a single user terminal server.
Does not scale as well as terminal server, which often can host 25 to 100 users per dual CPU server. VDI will likely scale from 10 to 20 VMs per dual CPU server, depending on how each VM is configured.（单服务器支持用户数少，比较致命的缺点）