Comparing Hyper-V Generation 1 and Generation 2 Virtual Machines

Hyper-V Role:
Windows Server Hyper-V role helps to Create and Manage the Virtual Machines. Hyper-V Role was first introduced in Windows Server 2008.

Earlier versions of Hyper-V Virtual Machines were not able to boot from SCSI Virtual Hard Drive and these Virtual Machines did not support the SCSI. Hyper-V BIOS is not aware of the SCSI Controllers and it only supports the IDE Drive and Legacy Network Adaptors, and that is why the Virtual Machine boots only from Legacy IDE Controller.

Virtual Machine Generation:
Microsoft introduced two Hyper-V Boot Architectures on Windows Server 2012R2 OS. One is Hyper-V BIOS and another is Hyper-V Unified Extensible Firmware Interface (UEFI).

Windows Server 2012R2 Hyper-V includes two types of Virtual Machine Generation, the Generation 1 and Generation 2.

Hyper-V Virtual Machine Generation can be defined as the Hardware and functionality that is available on the Virtual Machine.

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