virt-v2v-release-notes-2.0 - Man Page

virt-v2v release notes for 2.0


These are the release notes for virt-v2v 2.0. This describes the major changes since 1.42.

No release notes were published for 1.44, so that release is covered here.

Virt-v2v 2.0.0 was released on 14 March 2022.


There were no security-related bugs found in this release.

New features

Virt-v2v has been modularised allowing external programs to examine the state of the conversion and inject their own copying step. Further enhancements will be made to this new architecture in forthcoming releases.

The command line is almost identical apart from some debugging features that were removed (see below).  The only significant difference is that the output format (-of) now has to be specified if it is different from the input format, whereas previous versions of virt-v2v would use the same output format as input format automatically.

A lot of time was spent improving the performance of virt-v2v in common cases.

Implement conversion of ALT Linux guests (Mikhail Gordeev).

Many bug fixes and performance enhancements were made to oVirt imageio output (Nir Soffer).

There is a new virt-v2v-in-place(1) tool which replaces the existing virt-v2v --in-place option.

Virt-v2v can now convert guests which use LUKS encrypted logical volumes (Laszlo Ersek).

Option -oo rhv-direct has been replaced by -oo rhv-proxy, and direct mode (which is much faster) is now the default when writing to oVirt, with proxy mode available for restricted network configurations (thanks: Nir Soffer).

The following command line options were removed: --print-estimate, --debug-overlays, --no-copy.

Virt-v2v no longer installs the RHEV-APT tool in Windows guests.  This tool was deprecated and then removed in oVirt 4.3.

Deprecated tool virt-v2v-copy-to-local has been removed.  This was deprecated in November 2018.

Other fixes

Remove reference to prl_strg driver in Windows guests to avoid BSOD (Denis Plotnikov).

Fix conversions of UEFI Linux guests that don't provide their own fallback bootloader (Denis Plotnikov).

Remove use of nbdkit-readahead-filter(1).  This filter uses a naive strategy and it had several negative effects on conversions.

Remove prompts for interactive passwords.  Normally you should try to use the -ip and/or -op options to supply passwords.

For Windows guests, we insert a schtasks command.  However the parameters of this command are timezone dependent and so it failed in non-European timezones.  (Thanks: Dinesh Herath, Tomáš Golembiovský, Bryan Kinney, Mark Zealey, Xiaodai Wang)

Virt-v2v will reauthenticate with vCenter servers periodically when copying guests over HTTPS which stops large guests and/or slow copies taking longer than about 30 minutes from failing.

Virt-v2v now sets libguestfs SMP to match number of physical host CPUs, which helps performance of certain conversion steps.

Virt-v2v output to oVirt now attempts to set the machine and firmware type correctly.  Note an exact mapping is not always possible and oVirt may ignore our recommendations (incorrectly) sometimes.

Virt-v2v now generates a virtio-vsock device for guests which support it (Valeriy Vdovin).

All guests now need at least 100 MB of free space for conversion to succeed (Ming Xie).

Standard VGA instead of QXL is now used as the video type for converted guests (Laszlo Ersek).

Older guests (eg RHEL 6) will use the virtio-transitional model after conversion.  This feature and the machine type are now usually determined from the libosinfo database, falling back to hard-coded values if libosinfo is not available (Laszlo Ersek).

When virt-v2v prints messages to a pipe or file it no longer wraps them, making parsing simpler.  You can enable wrapping in this mode using --wrap (Laszlo Ersek).

Windows guest firstboot scripts installed by virt-v2v now run in the right order, making network configuration happen earlier (Laszlo Ersek).

Build changes

libguestfs ≥ 1.44 is now required.

nbdcopy(1) and OCaml NBD bindings, both from libnbd ≥ 1.10, are now required.

nbdkit ≥ 1.22 is now required (Nir Soffer).

pcre2 (instead of pcre) is now required.

gnulib is no longer bundled or used by virt-v2v.

OCaml ≥ 4.04 is now required.  OCaml 4.13 support has been added in this release.

OpenSSH scp ≥ 8.8 is now required.  Earlier versions will fail because the command line syntax was changed incompatibly.


Weblate instead of Zanata is now used for translations (Pino Toscano).

Bugs fixed

Missing error message of 'insufficient free space in the conversion server temporary directory'

nbdinfo output to stdout instead of stderr during virt-v2v conversion

virt-p2v conversion hangs with RHEL9 virt-v2v

'model='virtio-transitional' is wrongly added when converting windows guest to local by rhel9 v2v

virt-v2v hangs for several minutes when using -ic vpx://... -it vddk with incorrect IP address

Improve the unclear assertion failure at

Can not specify '-oo json-disks-pattern' in '-o json' mode

Failed to import VM when selecting OVA as a source on RHV webadmin

Conversion performance is not good when convert guest by modular virt-v2v

calling “get_disk_allocated” in “create_ovf” breaks the rhv-upload output plugin

RFE: Remove -oo rhv-direct and add -oo rhv-proxy option

nbdcopy command failed when using v2v to convert guest from ESXi6.5 via vddk > 6.5 + rhv-upload to rhv4.4

Add virt-v2v and libvirt version to the beginning of v2v debug log

V2V can't convert guest from VMware via vmx+ssh when openssh version is 8.7p1-5

There is no guest listed in export domain if use v2v to convert guest to rhv via -o rhv

virt-v2v can't convert bitblocker windows guest with libguestfs error: /dev/mapper/cryptsda: No such file or directory

The usage description of '-oo rhv-disk-uuid=UUID' in man virt-v2v should be updated

[RFE] Drop QXL for guests on CentOS 9 clusters

[RFE][v2v] [upload/download disk/CBT] Failed to attach disk to the VM - disk is OK but image transfer still holds a lock on the disk

Update privileges for Non-admin vmware role when ESXi host has enabled host encryption mode in virt-v2v-input-vmware man page

virt-v2v can't install qemu-guest-agent for rhel9 guest during conversion

assertion failed at when ova directory ends with '/'

Change video type from qxl to vga after v2v conversion

v2v import from vCenter fails when using interactive password because cookie-script tries to be interactive

Should improve the minimum free space for windows guest in v2v man page and better to improve v2v error message about no space left for windows guest

Delete or improve the warning info about rhev-apt during v2v converting windows guest on rhel9

Virt-v2v should add 'model='virtio-transitional' to RHEL <=6 guest virtio devices during conversion if target is rhel9 system

“virt-v2v: warning: there is no QXL driver for this version of Windows” still shows, even though we copied qxldod driver to the guest

VMware tools not getting uninstalled as part of IMS

Should hidden “virt-v2v: warning: /usr/share/virt-tools/pnp_wait.exe is missing..”during conversion

VDDK 6.7 repeatedly reconnects with nbdkit: vddk[1]: debug: NBD_ClientOpen: attempting to create connection to vpxa-nfc:// followed by virt-v2v failure

After virt-v2v, qemu-ga does not run at Windows firstboot if the timezone is not M/d/yyyy format

Should correct info about 'UEFI on OpenStack' in virt-v2v-support man page

Virt-v2v should convert UEFI guest to openstack via openstack option successfully

RFE: Should clarify which file is correct authentication file for openstack/glance conversion in virt-v2v-output-openstack man page

Ceph block device will be destroyed if v2v convert guest to ceph block device and guest disk size is greater than ceph block device

RFE: virt-v2v should check the ip info when specify guest's ip

V2V option --keys-from-stdin gives error: getline: Inappropriate ioctl for device

document that vmx+ssh “-ip” auth doesn't cover ssh / scp shell commands

nbdkit cannot read the password interactively when started from virt-v2v

Option --bandwidth and --bandwidth-file isn't working as expected during v2v conversion

There is no info “Opening the source -i libvirt -ic vpx://...” shown if any IP is wrong in vpx:// URL during v2v conversion

V2V doesn't ask password if there is no option about password file in v2v command line

[RFE]Remove cache=none for guest after v2v converting to libvirt

Virt-v2v cannot convert guest from ESXI7.0 server without vddk

v2v conversion will be failed because of memory allocation failure if convert guest from ESXi6.0 or ESXi6.5 via vddk, or use vddk6.5 to convert guest from VMware

virt-v2v should give more clear error info when use some special invalid uuids for disks

Virt-v2v firstboot scripts should run in order, with v2v network configuration happening first

V2V conversion fails when a filesystem has no free inodes

Virt-v2v can't convert guest using LUKS-on-LV

q35 switch caused: error: unsupported configuration: IDE controllers are unsupported for this QEMU binary or machine type

virt-v2v use Q35 as default machine-type

New way of parsing OVF from OVA that was created by VMware fails.

See Also

virt-v2v(1), virt-v2v-release-notes-1.42(1), guestfs-release-notes-1.40(1).


Authors of virt-v2v 2.0:

Denis Plotnikov

Kevin Locke

Laszlo Ersek

Martin Kletzander

Mikhail Gordeev

Nir Soffer

Pino Toscano

Richard W.M. Jones

Valeriy Vdovin


This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.


To get a list of bugs against libguestfs, use this link:

To report a new bug against libguestfs, use this link:

When reporting a bug, please supply:

Referenced By


2022-08-23 virt-v2v-2.1.8 Virtualization Support