Hyper-V: Terms

Hyper-V: Terms

Table of Contents

compact | differencing virtual hard disk (diffdisk) | dynamically expanding virtual hard disk (dynamic VHD, DVHD) | external virtual network | fixed-size virtual hard disk |  guest operating system | Hyper-V Manager | Hyper-V role | hypervisor | integration services | internal virtual network | legacy network adapter | live migration | management operating system | parent partition | physical computer | private virtual network | release key combination | saved state | .vfd or virtual floppy disk.vhd or virtual hard disk | virtual machine | virtual machine bus | virtual machine configuration | Virtual Machine Connection | Virtual Machine Management service | virtual machine snapshot | virtual network | Virtual Network Manager | virtualization server | Virtualization WMI provider 
 

compact
To reduce the size of a dynamically expanding virtual hard disk by removing unused space from the .vhd file. See also dynamically expanding virtual hard disk
 
differencing virtual hard disk (diffdisk)
A virtual hard disk that stores the changes or "differences" to an associated parent virtual hard disk for the purpose of keeping the parent intact. The differencing disk is a separate .vhd file (that may be stored in a separate location) that is associated with the .vhd file of the parent disk. These disks are often referred to as "children" or "child" disks to disintguish them from the "parent" disk. There can be only one parent disk in a chain of differencing disks. There can be one or more child disks in a differencing disk chain of disks that are "related" to each other. Changes continue to accumulate in the differencing disk until it is merged to the parent disk. See also virtual hard disk.
A common use for differencing disks is to manage storage space on a virtualization server. For example, you can create a base parent disk- such as a Windows 2008 R2 Standard base image - and use it as the foundation for all other guest virtual machines and disks that will be based on Windows Server 2008 R2.
NOTE: Any changes you make to the parent disk (such as software patches or compact/convert.degrament operations) may invalidate the chain and cause your child disks to stop functioning correctly.
For more information on differencing disks see:
 
dynamically expanding virtual hard disk (dynamic VHD, DVHD)
A virtual hard disk that grows in size each time it is modified. This type of virtual hard disk starts as a 3 KB .vhd file and can grow as large as the maximum size specified when the file was created. The only way to reduce the file size is to zero out the deleted data and then compact the virtual hard disk. See also virtual hard disk, VHD.
 
external virtual network
A virtual network that is configured to use a physical network adapter. These networks are used to connect virtual machines to external networks. See also internal virtual network, private virtual network.
 
fixed-size virtual hard disk
A virtual hard disk with a fixed size that is determined and for which all space is allocated when the disk is created. The size of the disk does not change when data is added or deleted. See also virtual hard disk, VHD.
 
guest operating system
The operating system running on a virtual machine. See also virtual machine,VM, child partition.
 
management operating system
The operating system that was originally installed on the physical machine when the Hyper-V role was enabled. After installing the Hyper-V role, this operating system is moved into the parent partition. The management operating system automatically launches when you reboot the physical machine. The management operating system actually runs in a special kind of virtual machine that can create and manage the virtual machines that are used to run workloads and/or different operating systems. These virtual machines are sometimes also called child partitions. The management operating system provides management access to the virtual machines and an execution environment for the Hyper-V services. The management operating system also provides the virtual machines with access to the hardware resources it owns. See also virtualization server, management operating system, physical computer,. host 
 
physical computer
The computer, or more specifically, the hardware that is running the Hyper-V role. See also management operating system.
 
Hyper-V Manager
The MMC snap-in that is used to manage the Hyper-V role. See also Hyper-V role
 
Hyper-V role
The role that enables you to create and manage virtual machines and their resources on a single physical server. See also Hyper-V Manager
 
hypervisor
The layer of software that exists above the hardware and below the management operating system. It creates partitions to provide isolated execution environments and manages each partition's access to hardware resources.
 
integration services
A collection of services and software drivers that maximize performance and provide a better user experience within a virtual machine. Integration services are only available for supported guest operating systems.
 
internal virtual network
A virtual network that is not bound to a physical network adapter. It allows communication between virtual machines on the same physical server and virtual machines and the management operating system. See also external virtual network, private virtual network
 
legacy network adapter
A virtual network adapter that emulates a specific physical network adapter, the multiport DEC 21140 10/100TX 100 MB. A legacy network adapter also supports network-based installations because it includes the ability to boot to the Pre-Boot Execution Environment.
 
live migration
The Hyper-V technology in Windows Server 2008 R2 that enables you to transparently move running virtual machines from one node of the failover cluster to another node in the same cluster without a dropped network connection or perceived downtime.
 
parent partition
The partition used to store the management operating system.
 
 
private virtual network
A virtual network without a virtual network adapter in the management operating system. It allows communication only between virtual machines on the same physical server.
See also external virtual network, internal virtual network
 
release key combination
The key combination (CTRL+ALT+LEFT ARROW by default) that must be pressed to move keyboard and mouse focus from a guest operating system back to the physical computer.
 
saved state
A manner of storing a virtual machine so that it can be quickly resumed (similar to a hibernated laptop). When you place a running virtual machine in a saved state, Virtual Server and Hyper-V stop the virtual machine, write the data that exists in memory to temporary files, and stop the consumption of system resources. Restoring a virtual machine from a saved state returns it to the same condition it was in when its state was saved.
 
.vfd or virtual floppy disk
The file format for a virtual floppy disk. See also virtual floppy disk
 
.vhd or virtual hard disk
The file format for a virtual hard disk, the storage medium for a virtual machine. It can reside on any storage topology that the management operating system can access, including external devices, storage area networks, and network-attached storage. See also virtual hard disk
 
 
virtual machine
A computer that is a software implementation of a computer. Virtual machines are used to run different operating systems at the same time on one physical computer. Each operating system runs in its own isolated execution environment. See also guest operating system
 
virtual machine bus
A communications line used in Hyper-V by virtual machines and certain types of virtual devices. The virtual devices that use virtual machine bus have been optimized for use in virtual machines. See also virtual machine
 
virtual machine configuration
The configuration of the resources assigned to a virtual machine. Examples include devices such as disks and network adapters, as well as memory and processors.
 
Virtual Machine Connection
A Hyper-V management tool that allows a running virtual machine to be managed through an interactive session.
 
Virtual Machine Management service
The Hyper-V service that provides management access to virtual machines.
 
virtual machine snapshot
Use to refer to a file-based snapshot of the state, disk data, and configuration of a virtual machine at a specific point in time.
See also virtual machine
 
virtual network
A virtual version of a physical network switch. A virtual network can be configured to provide access to local or external network resources for one or more virtual machines.
See also external virtual network, internal virtual network, private virtual network
 
Virtual Network Manager
The Hyper-V component used to create and manage virtual networks.
 
virtualization server
A physical computer with the Hyper-V role installed. This server contains the management operating system and it provides the environment for creating and running virtual machines. Sometimes referred to as a server running Hyper-V. See also management operating system, physical computer
 
 
Virtualization WMI provider
The WMI provider for virtualization that can be used with the hypervisor API to enable developers and scripters to build custom tools, utilities, and enhancements for the virtualization platform. 
 

 

See Also

  

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Comments
  • Thanks.

  • Carsten Siemens edited Revision 26. Comment: fixed typo

  • Useful

  • awesome

  • This is great.  Please keep it up to date.  How about pass-through scsi (or disk), hyper-v over CSV, hyper-v over SMB, CSV, etc.

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