Scsi boot virtual machines in previous versions of

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SCSI boot Virtual machines in previous versions of Hyper-V needed to boot from integrated development environment (IDE) disks (virtual disks attached to the virtual machine using the IDE controller). Beginning with Windows Server 2012 R2, however, Generation 2 virtual machines can now boot directly from SCSI disks (virtual disks attached to the virtual machine using the SCSI controller). In fact, Generation 2 virtual machines don’t even have an IDE controller! Generation 2 virtual machines can also boot from a SCSI virtual DVD.
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8 CHAPTER 2 Hyper-V Faster deployment Network-based installation of a guest operating system onto a Generation 2 virtual machine is significantly faster than for the previous generation of Hyper-V virtual machines for two reasons. First, the Legacy Network Adapter device is no longer required (or even supported) by Generation 2 virtual machines. Instead, you can PXE-boot a Generation 2 virtual machine using a standard network adapter. Second, the SCSI controller performs much better than the legacy IDE controller in the previous generation of virtual machines. The result is that installing a supported guest operating system in a Generation 2 virtual machine takes only about half the time as installing the same guest operating system in a previous generation virtual machine. TABLE 2-1 Hardware Device Changes in Generation 2 Virtual Machines Legacy Devices Removed Replacement Devices Enhancements IDE controller Virtual SCSI controller Boot from VHDX (64 TB max size, online resize) IDE CD-ROM Virtual SCSI CD-ROM Hot add/remove Legacy BIOS UEFI firmware Secure Boot Legacy NIC Synthetic NIC Network boot with IPv4 & IPv6 Floppy & DMA Controller No floppy support UART (COM Ports) Optional UART for debugging Faster and more reliable i8042 keyboard controller Software-based input No emulation—reduced resources PS/2 keyboard Software-based keyboard No emulation—reduced resources PS/2 mouse Software-based mouse No emulation—reduced resources S3 video Software-based video No emulation—reduced resources PCI Bus VMBus Programmable Interrupt Controller (PIC) No longer required Programmable Interrupt Timer (PIT) No longer required Super I/O device No longer required Because of all these hardware changes, Generation 2 virtual machines only support the following versions of Windows as guest operating systems: 64-bit versions of Windows 8 and Windows Server 2012 64-bit versions of Windows 8.1 and Windows Server 2012 R2
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Generation 2 virtual machines CHAPTER 2 9 As Figure 2-1 shows, when you create a new virtual machine in Windows Server 2012 R2 using Hyper-V Manager, you now have the option of choosing whether to create a first-generation virtual machine or a Generation 2 virtual machine. You can also specify which type of virtual machine is to be created by using the New-Generation parameter of the New-VM Windows PowerShell cmdlet in Windows Server 2012 R2.
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