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Chapter 3. Converting virtual machines to run on KVM managed by libvirt

Warning

The Red Hat Enterprise Linux 6 version of the virt-v2v utility has been deprecated. Users of Red Hat Enterprise Linux 6 are advised to create a Red Hat Enterprise 7 virtual machine, and install virt-v2v in that virtual machine. The Red Hat Enterprise Linux 7 version is fully supported and documented in virt-v2v Knowledgebase articles.
virt-v2v can convert virtual machines to run on Red Hat Enterprise Linux, using KVM managed by libvirt. Virtual machines can be converted from Xen, KVM, VMware ESX / ESX(i), and Hyper-V environments. The libvirt and virsh commands are documented in the Red Hat Enterprise Linux Virtualization Administration Guide. You may also use the command man virsh for more information.

3.1. Introduction
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The virt-v2v command converts virtual machines from a foreign hypervisor to run on KVM, managed by libvirt. The following guest operating systems are supported by virt-v2v:
  • Red Hat Enterprise Linux 3.9
  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Windows XP
  • Windows Vista
  • Windows 7
  • Windows Server 2003
  • Windows Server 2008
The following hypervisors are supported:
  • KVM
  • libvirt-managed Xen
  • VMware ESX / ESX(i) - versions 3.5, 4.0, 4.1, 5.0, 5.1
The virt-v2v command enables paravirtualized (virtio) drivers in the converted guest, if possible.
virt-v2v is available on Red Hat Customer Portal in the Red Hat Enterprise Linux Server (v.6 for 64-bit x86_64) or Red Hat Enterprise Linux Workstation (v.6 for x86_64) channel.
The virt-v2v tool requires root access to the host system.
Some of the new features for virt-v2v starting with Red Hat Enterprise Linux 6 are:
  • The -op and -osd command line options continue to be supported, but are deprecated in favor of -os. There is no deprecation warning when they are used.
  • The -of command line option allows specification of the file format to be used for target storage: raw or qcow2. This feature allows for the conversion of a virtual machine with raw storage to qcow2 and vice versa.
  • The -oa command line option allows the allocation policy of the target storage to be specified: sparse or preallocated. This can be used to convert between sparse and preallocated. Underlying this change, sparse volumes are now supported.
  • The configuration file can now contain target profiles, which specify the storage location, output format and allocation policy for a target. This allows the user to specify --profile<foo> rather than -os<a> -op<b> -oa<oc>.
  • The conversion of Windows virtual machines to libvirt targets is supported.
Refer to the virt-v2v man page for further details on these and other features.
To install virt-v2v from the Red Hat Customer Portal, ensure the system is subscribed to the appropriate channel, then run: 
# yum install virt-v2v
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