1. Massive scale

  • Up to 64 virtual processors
  • Up to 1 TB of memory per VM
  • Up to 64 TB per virtual disk
  • Up to 64 nodes in a cluster
  • Up to 8,000 VMs in a cluster

2. Networking

  • Network Virtualization in the box
  • Open, Extensible Virtual Switch
  • SR-IOV
  • In the box Windows Teamed NICs

3. VM Mobility

  • Shared Nothing Live Migration
  • Live Storage Migration
  • Concurrent Live Migration and Live Storage Migrations

4. Storage

  • New VHDX format
  • Support for Trim/Unmap
  • Support for Offloaded Data Transfer (ODX)
  • Support on SMB 3.0 File Shares such as the new Windows Server 2012 File Server

5. Automation/Manageability

  • Pervasive PowerShell
  • over 2400 PowerShell Commandlets for Windows Server 2012 overall
  • over 150 PowerShell Commandlets just for Hyper-V in Windows Server 2012
  • Cluster Aware Updating (CAU)

6. Performance

  • Windows Server 2012 Hyper-V can deliver over 1 MILLION IOPs from a single VM…

7. . . . . .

 

There are so many more reasons why. Read the Windows Server 2012 Evaluation Guide.