|A component of Windows Server|
|Replaces||Windows Virtual PC|
|App-V, MED-V, Remote Desktop Connection|
Hyper-V, codenamed Viridian and formerly known as Windows Server Virtualization, is a native hypervisor; it can create virtual machines on x86-64 systems. Starting with Windows 8, Hyper-V supersedes Windows Virtual PC as the hardware virtualization component of the client editions of Windows NT. A server computer running Hyper-V can be configured to expose individual virtual machines to one or more networks.
- 1 History
- 2 Architecture
- 3 System requirements
- 4 Supported guests
- 5 VHD compatibility with Virtual Server 2005 and Virtual PC 2004/2007
- 6 Limitations
- 7 Windows 8
- 8 Windows Server 2012
- 9 See also
- 10 References
- 11 Further reading
- 12 External links
A beta version of Hyper-V was shipped with certain x86-64 editions of Windows Server 2008. The finalized version was released on June 26, 2008 and was delivered through Windows Update. Hyper-V has since been released with every version of Windows Server.
Microsoft provides Hyper-V through two channels:
- Part of Windows: Hyper-V is an optional component of Windows Server 2008 and later. It is also available in x64 SKUs of Pro and Enterprise editions of Windows 8 and Windows 8.1.
- Hyper-V Server: It is a freeware edition of Windows Server with limited functionality and Hyper-V component.
Hyper-V Server 2008 was released on October 1, 2008. It consists of Windows Server 2008 Server Core and Hyper-V role; other Windows Server 2008 roles are disabled, and there are limited Windows services. Hyper-V Server 2008 is limited to a command-line interface (CLI) used to configure the host OS, physical hardware and software. A menu driven CLI interface and some freely downloadable script files simplify configuration. In addition, Hyper-V Server supports remote access via Remote Desktop Connection. However, administration and configuration of the host OS and the guest virtual machines is generally done over the network, using either Microsoft Management Consoles on another Windows computer or System Center Virtual Machine Manager. This allows much easier "point and click" configuration, and monitoring of the Hyper-V Server.
Hyper-V Server 2008 R2 (an edition of Windows Server 2008 R2) was made available in September 2009 and includes Windows PowerShell v2 for greater CLI control. Remote access to Hyper-V Server requires CLI configuration of network interfaces and Windows Firewall. Also using a Microsoft Vista PC to administer Hyper-V Server 2008 R2 is not fully supported.
Hyper-V implements isolation of virtual machines in terms of a partition. A partition is a logical unit of isolation, supported by the hypervisor, in which each guest operating system executes. A hypervisor instance has to have at least one parent partition, running a supported version of Windows Server (2008 and later). The virtualization stack runs in the parent partition and has direct access to the hardware devices. The parent partition then creates the child partitions which host the guest OSs. A parent partition creates child partitions using the hypercall API, which is the application programming interface exposed by Hyper-V.
A child partition does not have access to the physical processor, nor does it handle its real interrupts. Instead, it has a virtual view of the processor and runs in Guest Virtual Address, which, depending on the configuration of the hypervisor, might not necessarily be the entire virtual address space. Depending on VM configuration, Hyper-V may expose only a subset of the processors to each partition. The hypervisor handles the interrupts to the processor, and redirects them to the respective partition using a logical Synthetic Interrupt Controller (SynIC). Hyper-V can hardware accelerate the address translation of Guest Virtual Address-spaces by using second level address translation provided by the CPU, referred to as EPT on Intel and RVI (formerly NPT) on AMD.
Child partitions do not have direct access to hardware resources, but instead have a virtual view of the resources, in terms of virtual devices. Any request to the virtual devices is redirected via the VMBus to the devices in the parent partition, which will manage the requests. The VMBus is a logical channel which enables inter-partition communication. The response is also redirected via the VMBus. If the devices in the parent partition are also virtual devices, it will be redirected further until it reaches the parent partition, where it will gain access to the physical devices. Parent partitions run a Virtualization Service Provider (VSP), which connects to the VMBus and handles device access requests from child partitions. Child partition virtual devices internally run a Virtualization Service Client (VSC), which redirect the request to VSPs in the parent partition via the VMBus. This entire process is transparent to the guest OS.
Virtual devices can also take advantage of a Windows Server Virtualization feature, named Enlightened I/O, for storage, networking and graphics subsystems, among others. Enlightened I/O is specialized virtualization-aware implementation of high level communication protocols like SCSI to take advantage of VMBus directly, that allows bypassing any device emulation layer. This makes the communication more efficient, but requires the guest OS to support Enlightened I/O.
Currently only the following operating systems support Enlightened I/O, allowing them therefore to run faster as guest operating systems under Hyper-V than other operating systems that need to use slower emulated hardware:
- Windows Server 2008 and later
- Windows Vista and later
- Red Hat Enterprise Linux
- SUSE Linux
- Host operating system:
- To install the Hyper-V role, Windows Server 2008, Windows Server 2008 R2 Standard, Enterprise or Datacenter edition, Windows Server 2012 Standard or Datacenter edition, or Windows 8 (or 8.1) Pro or Enterprise edition is required. Hyper-V is only supported on x86-64 variants of Windows.
- It can be installed regardless of whether the installation is a full or core installation.
- An x86-64 processor
- Hardware-assisted virtualization support: This is available in processors that include a virtualization option; specifically, Intel VT or AMD Virtualization (AMD-V, formerly code-named "Pacifica").
- A NX bit-compatible CPU must be available and Hardware Data Execution Prevention (DEP) must be enabled.
- Although this is not an official requirement, Windows Server 2008 R2 and a CPU with second-level address translation support are recommended for workstations.
- Second-level address translation is a mandatory requirement for Hyper-V in Windows 8.
- Minimum 2 GB. (Each virtual machine requires its own memory, and so realistically much more.)
- Windows Server 2008 Standard (x64) Hyper-V full GUI or Core supports up to 31 GB of memory for running VMs, plus 1 GB for the Hyper-V parent OS.
- Maximum total memory per system for Windows Server 2008 R2 hosts: 32 GB (Standard) or 2 TB (Enterprise, Datacenter) 
- Maximum total memory per system for Windows Server 2012 hosts: 4 TB
- Guest operating systems
- Hyper-V in Windows Server 2008 and 2008 R2 supports virtual machines with up to 4 processors each (1, 2, or 4 processors depending on guest OS-see below)
- Hyper-V in Windows Server 2012 supports virtual machines with up to 64 processors each.
- Hyper-V in Windows Server 2008 and 2008 R2 supports up to 384 VMs per system
- Hyper-V in Windows Server 2012 supports up to 1024 active virtual machines per system.
- Hyper-V supports both 32-bit (x86) and 64-bit (x64) guest VMs.
Microsoft Hyper-V Server
The stand-alone Hyper-V Server variant does not require an existing installation of Windows Server 2008 nor Windows Server 2008 R2. The standalone installation is called Microsoft Hyper-V Server for the non-R2 version and Microsoft Hyper-V Server 2008 R2. Microsoft Hyper-V Server is built with components of Windows and has a Windows Server Core user experience. None of the other roles of Windows Server are available in Microsoft Hyper-V Server. This version supports up to 64 VMs per system. System requirements of Microsoft Hyper-V Server are the same for supported guest operating systems and processor, but differ in the following:
- RAM: Minimum: 1 GB RAM; Recommended: 2 GB RAM or greater; Maximum 1 TB.
- Available disk space: Minimum: 8 GB; Recommended: 20 GB or greater.
Hyper-V Server 2012 R2 has the same capabilities as the standard Hyper-V role in Windows Server 2012 R2 and supports 1024 active VMs. 
|Guest OS||Virtual processors||Edition(s)||CPU architecture|
|Windows Server 2012[a]||1–4||Enterprise, Datacenter||x64|
|Windows Home Server 2011||1, 2 or 4||Standard||x64|
|Windows Server 2008 R2 SP1||1–4||Web, Standard, Enterprise, Datacenter||x64|
|Windows Server 2008 SP2||1–4||Web, HPC, Standard, Enterprise, Datacenter||IA-32, x64|
|Windows Server 2003 SP2||1 or 2||Web,[b] Standard, Enterprise, Datacenter||IA-32, x64|
|Windows Server 2003 R2||1 or 2||Web,[b] Standard, Enterprise, Datacenter||IA-32, x64|
|Windows 2000 Server SP4||1||Server, Advanced Server||IA-32|
|Windows 7||1–4||Professional, Enterprise, Ultimate||IA-32, x64|
|Windows Vista||1 or 2||Business, Enterprise, Ultimate||IA-32, x64|
|Windows XP SP2-SP3||1 or 2||Professional||IA-32|
|Windows XP x64 SP2||1 or 2||N/A||x64|
|SUSE Linux Enterprise Server 10 SP4 or 11 SP1–SP3||1–4||N/A||IA-32, x64|
|Red Hat Enterprise Linux 5.5–7.0||1–4||N/A||IA-32, x64|
|CentOS 5.5–7.0||1–4||N/A||IA-32, x64|
|Ubuntu 12.04–14.04||1–4||N/A||IA-32, x64|
|Debian 7.0||1–4||N/A||IA-32, x64|
|Oracle Linux 6.4||1–4||Red Hat Compatible Kernel||IA-32, x64|
- Windows Server 2012 is supported and runs only on a host system Windows Server 2008 R2 RTM or SP1, with a hotfix applied.
- Web edition does not have an x64 version
Third-party support for FreeBSD 8.2 and later guests is provided by a partnership between NetApp and Citrix. This includes both emulated and paravirtualized modes of operation, as well as several HyperV integration services.
Desktop virtualization (VDI) products from third-party companies (such as Quest Software vWorkspace, Citrix XenDesktop, Systancia AppliDis Fusion and Ericom PowerTerm WebConnect) provide the ability to host and centrally manage desktop virtual machines in the data center while giving end users a full PC desktop experience.
Guest operating systems with Enlightened I/O and a hypervisor-aware kernel such as Windows Server 2008 and later server versions, Windows Vista SP1 and later clients and offerings from Citrix XenServer and Novell will be able to use the host resources better since VSC drivers in these guests communicate with the VSPs directly over VMBus. Non-"enlightened" operating systems will run with emulated I/O; however, integration components (which include the VSC drivers) are available for Windows Server 2003 SP2, Windows Vista SP1 and Linux to achieve better performance. Xen-enabled Linux guest distributions can also be paravirtualized in Hyper-V. As of 2013[update] Microsoft officially supports only SUSE Linux Enterprise Server 10 SP1/SP2 x86 and x64 Editions in this way, though any Xen-enabled Linux should be able to run. In February 2008, Red Hat and Microsoft signed a virtualization pact for hypervisor interoperability with their respective server operating systems, to enable Red Hat Enterprise Linux 5 to be officially supported on Hyper-V.
In July 2009, Microsoft submitted Hyper-V drivers to the kernel, which improve the performance of virtual Linux guest systems in a Windows hosted environment. Microsoft was forced to submit the code when it was discovered that Microsoft had incorporated a Hyper-V network driver with GPL-licensed components statically linked to closed-source binaries. Hyper-V provides basic virtualization support for Linux guests out of the box. Paravirtualization support is, however, available by installing the Linux Integration Components or Satori InputVSC drivers. On July 20, 2009, Microsoft submitted these drivers for inclusion in the Linux kernel under the terms of the GPL, so that kernels from 2.6.32 may include inbuilt Hyper-V paravirtualization support.
Windows Server 2012
- Windows 8 (with up to 32 CPUs), Windows 8.1 (32 CPUs), Windows Server 2012 (64 CPUs) and Windows Server 2012 R2 (64 CPUs) are supported.
- Minimum supported version of CentOS is 6.0.
- Minimum supported version of Red Hat Enterprise Linux is 5.7.
- Maximum number of supported CPUs for Windows Server and Linux operating system is increased from four to 64.
VHD compatibility with Virtual Server 2005 and Virtual PC 2004/2007
Hyper-V, like Microsoft Virtual Server and Windows Virtual PC, saves each guest OS to a single virtual hard disk file with the extension .VHD, except in Windows 8 and Windows Server 2012 where it can be the newer .vhdx. This file contains the entire guest OS, though other files can also be configured to allow "undo information" etc.
Older .vhd files from Virtual Server 2005 and Virtual PC 2004/2007 can be copied and used by Hyper-V, but any old virtual machine integration software (equivalents of Hyper-V Integration Services for other virtualization software) must be removed from the virtual machine. After the migrated guest OS is configured and started using Hyper-V, the guest OS will detect changes to the (virtual) hardware. Installing "Hyper-V Integration Services" installs five services to improve performance, at the same time adding the new guest video and network card drivers. Consequently, Windows guests may require re-activation.
Hyper-V supports USB devices in Hyper-V guest VMs with a new feature called Virtual Machine Connection- Enhanced Session Mode. This fact makes it very inconvenient to run software protected by dongles in the guest. A workaround to access USB drives in Windows guest VMs involves using the Microsoft Remote Desktop Client to "share" host drives with guests over a Remote Desktop Connection.
Hyper-V does not virtualize audio hardware. Before Windows 8.1 and Windows Server 2012 R2, it was possible to work around this issue by connecting to the virtual machine with Remote Desktop Connection over a network connection and use its audio redirection feature. Windows 8.1 and Windows Server 2012 R2 add the enhanced session mode which provides redirection without a network connection.
Optical drives pass-through
Optical drives virtualized in the guest VM are read-only. Hyper-V does not support the host/root operating system's optical drives to pass-through in guest VMs. As a result, burning to discs, audio CDs, video CD/DVD-Video playback are not supported. However a workaround exists using the iSCSI protocol. Setting up an iSCSI target on the host machine with the optical drive can then be talked to by the standard Microsoft iSCSI initiator. Microsoft produces their own iSCSI Target software or alternative third party products can be used.
Graphics issues on the host
On CPUs without Second Level Address Translation, installation of most WDDM accelerated graphics drivers on the primary OS will cause a dramatic drop in graphic performance. This occurs because the graphics drivers access memory in a pattern that causes the Translation lookaside buffer to be flushed frequently.
In Windows Server 2008, Microsoft officially supported Hyper-V only with the default VGA drivers, which do not support Windows Aero, higher resolutions, rotation, or multi-monitor display. However, unofficial workarounds were available in certain cases. Older non-WDDM graphics drivers sometimes did not cause performance issues, though these drivers did not always install smoothly on Windows Server. Intel integrated graphics cards did not cause TLB flushing even with WDDM drivers. Some NVidia graphics drivers did not experience problems so long as Windows Aero was turned off and no 3D applications were running.
In Windows Server 2008 R2, Microsoft added support for Second Level Address Translation to Hyper-V. Since SLAT is not required to run Hyper-V with Windows Server, the problem will continue to occur if a non-SLAT CPU is used with accelerated graphics drivers. However, SLAT is required to run Hyper-V on client versions of Windows 8.
Hyper-V in Windows Server 2008 does not support "live migration" of guest VMs (where "live migration" is defined as maintaining network connections and uninterrupted services during VM migration between physical hosts). Instead, Hyper-V on Server 2008 Enterprise and Datacenter Editions supports "quick migration", where a guest VM is suspended on one host and resumed on another host. This operation happens in the time it takes to transfer the active memory of the guest VM over the network from the first host to the second host.
However, with the release of Windows Server 2008 R2, live migration is supported with the use of Cluster Shared Volumes (CSVs). This allows for failover of an individual VM as opposed to the entire host having to failover (it seems that when a node (Hyper-V server, not a VM) fails then each "VM running on the failed node" may migrate to other live nodes independently of "other VMs on the same LUN running on other nodes that share the LUN with the failed node". In Hyper-V we are clustering the Hyper-V nodes not the VMs.). See also Cluster Shared Volumes.
Windows Server 2012's implementation of Hyper-V (Version 3.0) introduced many new features to increase VM mobility, including the ability to execute simultaneous live migrations (Windows Server 2008 R2 only supported live migrating a single VM at a time, significantly increasing the time required to carry administrative tasks, such as draining a node for scheduled maintenance). The only real limiting factor here is hardware and network bandwidth available. Windows Server 2012 also supports a new "shared nothing live migration" option, where no traditional shared storage is required in order to complete a migration. Also referred to as “Live System Migration”, a shared nothing live migration will move a running VM and its storage from one Hyper-V host to another without any perceived downtime. Live Migration between different host OS versions is not possible, although this is soon to be addressed in Windows Server 2012 R2.
Windows Server 2012 also introduced the ability to use simple SMB shares as a shared storage option (in conjunction with the new Scale out File Services role in Server 2012 for highly available environments), alleviating the need for expensive SANs. This is particularly useful for low budget environments, without the need to sacrifice performance due to the many new improvements to the SMB3 stack. Windows Server 2012 will fully support the live migration of VMs running on SMB shares, whether it be a live or live system migration.
Hyper-V under Windows Server 2012 also supports the ability to migrate a running VM's storage, whereby an active Virtual Machines storage can be moved from one infrastructure to another without the VM's workload being affected, further reducing the limitations associated with VM mobility.
With the introduction of Windows Server 2012 R2, SMB 3.0 was introduced as a transport option for Live Migration, either between clustered or non-clustered virtualization hosts. This enables Hyper-V Live Migration to leverage the additional benefits that SMB 3.0 brings, such as SMB Multichannel and SMB Direct (in conjunction with RDMA NICs) for increased Live Migration performance.
Degraded performance for Windows XP VMs
Windows XP frequently accesses CPU's APIC task-priority register (TPR) when interrupt request level changes, causing a performance degradation when running as guests on Hyper-V. Microsoft has fixed this problem in Windows Server 2003 and later.
Intel adds TPR virtualization (FlexPriority) to VT-x on Intel Core 2 step E onwards to alleviate this problem. AMD has a similar feature on AMD-V but uses a new register for the purpose. This however means that the guest has to use different instructions to access this new register. AMD provides a driver called "AMD-V Optimization Driver" that has to be installed on the guest to do that.
Network card teaming or link aggregation is only supported if the NIC manufacturer supplied drivers support NIC teaming. However, Windows Server 2012 and thus the version of Hyper-V included with it supports software NIC teaming.
Hyper-V 2012 can only be managed by Windows 8, Windows Server 2012 or their successors.
64-bit SKUs of Windows 8 Pro or Enterprise edition come with Hyper-V.
Windows Server 2012
- Hyper-V Extensible Virtual Switch
- Network virtualization
- Storage Resource Pools
- .vhdx disk format supporting virtual hard disks as large as 64 TB with power failure resiliency
- Virtual Fibre Channel
- Offloaded data transfer
- Hyper-V replica
- Cross-premise connectivity
- Cloud backup
- Comparison of platform virtualization software
- Features new to Windows 8#Virtualization
- Virtual disk image
- Microsoft Open Specification Promise
- Virtual private server
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|Wikiversity has learning materials about Hyper-V|
- Official website
- Official blog
- Virtualization Fabric Design Considerations Guide
- Hyper-V on Microsoft TechNet
- Benchmarking Hyper-V on Windows Server 2008 R2 x64
- Hyper-V Architecture
- Hyper-V Architecture (German)
- Hyper-V CPU Requirements (German)
- Details about Cluster Shared Volume (German)