Difference between pages "Virtual Hard Disk (VHD)" and "Libqcow"

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(Snapshots)
 
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{{expand}}
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{{Infobox_Software |
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  name = libqcow |
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  maintainer = [[Joachim Metz]] |
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  os = [[Linux]], [[FreeBSD]], [[NetBSD]], [[OpenBSD]], [[Mac OS X]], [[Windows]] |
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  genre = {{Disk imaging}} |
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  license = {{LGPL}} |
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  website = [http://code.google.com/p/libqcow/ code.google.com/p/libqcow] |
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}}
  
The Virtual Hard Disk (VHD) commonly uses the .vhd extension.
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The '''libqcow''' package contains a library and applications to read the [[QCOW_Image_Format | QEMU Copy-On-Write (QCOW) image]] format.
  
This format is used to store virtual disk images by:
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== Tools ==
* Microsoft Virtual PC
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The '''libqcow''' package contains the following tools:
* Microsoft Virtual Server
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* '''qcowinfo''', which shows the information about QCOW files.
* Microsoft Hyper-V Server
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* '''qcowmount''', which FUSE mounts QCOW image files.
  
VHD support is also integrated into [[Windows]] (at least in Windows 7) where "Disk Management" (part of "Computer Management") supports attaching and creating Fixed and Dynamic VHD image files.
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== Examples ==
  
== Image types ==
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FUSE mounting a QCOW image (libqcow 20111009 or later)
There are multiple types of Virtual Hard Disk (VHD) images:
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<pre>
* Fixed-size hard disk image; the image contains all data
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qcowmount image.qcow mount_point
* Dynamic-size (or sparse) hard disk image; the image contains used data only
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</pre>
* Differential (or differencing, or delta) hard disk image; the image contains changes relative to its parent image
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== Snapshots ==
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== History ==  
Hyper-V has functionality to create snapshots.
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These snapshots are stored in Snapshot Differencing Disk (AVHD) files which commonly uses the .avhd extension.
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Libqcow was created by [[Joachim Metz]] in 2010.
  
The snapshot can be interdependent on one-another, because they are differential images of the previous snapshot.
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== Also See ==
 
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[[QCOW_Image_Format | QEMU Copy-On-Write (QCOW) image format]]
== See Also ==
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* [[Disk Images]]
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* [[Windows]]
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== External Links ==
 
== External Links ==
 
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* [https://code.google.com/p/libqcow/ Project site]
* [http://en.wikipedia.org/wiki/VHD_(file_format) VHD (file format)], by Wikipedia
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* [https://code.google.com/p/libqcow/wiki/Building Building libqcow and tools from source]
* [http://technet.microsoft.com/en-us/library/bb676673.aspx Virtual Hard Disk Image Format Specification], by Microsoft, October 2006
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* [https://code.google.com/p/libqcow/wiki/Mounting Mounting a QCOW image]
* [https://googledrive.com/host/0B3fBvzttpiiSY250RjRzRXQ0bDg/Virtual%20Hard%20Disk%20(VHD)%20image%20format.pdf Virtual Hard Disk (VHD) image format], by the [[libvhdi|libvhdi project]], September 2012
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=== Snapshots ===
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* [http://social.technet.microsoft.com/wiki/contents/articles/670.hyper-v-concepts-snapshots.aspx Hyper-V Concepts - Snapshots]
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* [http://blogs.msdn.com/b/virtual_pc_guy/archive/2008/03/11/virtual-machine-snapshotting-under-hyper-v.aspx Virtual Machine Snapshotting under Hyper-V]
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* [http://www.msserveradmin.com/hyper-v-snapshot-files-avhd-and-vhd-what-the/ Hyper-V SnapShot Files – AVHD and VHD? What The ?]
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* [http://social.technet.microsoft.com/wiki/contents/articles/6257.manually-merge-avhd-to-vhd-in-hyper-v.aspx Manually Merge .avhd to .vhd in Hyper-V]
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== Tools ==
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* [[libvhdi]]
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[[Category:File Formats]]
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Latest revision as of 00:29, 15 July 2013

libqcow
Maintainer: Joachim Metz
OS: Linux, FreeBSD, NetBSD, OpenBSD, Mac OS X, Windows
Genre: Disk imaging
License: LGPL
Website: code.google.com/p/libqcow

The libqcow package contains a library and applications to read the QEMU Copy-On-Write (QCOW) image format.

Contents

Tools

The libqcow package contains the following tools:

  • qcowinfo, which shows the information about QCOW files.
  • qcowmount, which FUSE mounts QCOW image files.

Examples

FUSE mounting a QCOW image (libqcow 20111009 or later)

qcowmount image.qcow mount_point

History

Libqcow was created by Joachim Metz in 2010.

Also See

QEMU Copy-On-Write (QCOW) image format

External Links