Provided by: virt-v2v_2.4.0-2build4_amd64 
NAME
virt-v2v-inspector - Estimate disk space needed before virt-v2v conversion
SYNOPSIS
virt-v2v-inspector [-i* options] guest [-O output.xml]
DESCRIPTION
Virt-v2v-inspector is a companion tool for virt-v2v(1) which can be used before conversion to estimate
the number of output disks and disk space that will be required to complete the virt-v2v conversion. The
common use for this is to preallocate target disks on management systems that need this (like Kubevirt).
This manual page only documents the estimation feature, not all of the -i* options which are the same as
virt-v2v. You should read virt-v2v(1) first.
Selecting the input guest
You can run virt-v2v-inspector with the same -i* options as virt-v2v. (Don't use any -o* options). This
will select the guest that you want to estimate.
For example to estimate the space required for a guest in a stored local disk called filename.img you
could do:
virt-v2v-inspector -i disk filename.img
Output
The output from this tool is an XML document.
• Fields which are annotated with an "estimated='true'" attribute are estimated. Virt-v2v cannot
always know exactly the final size of some things, such as the exact real size of the output disk,
since there might be small perturbations between runs. Estimates are usually very close to the final
values.
• Numbers representing sizes are always given in bytes.
• By default the output is written to stdout. This is useful when using the program interactively.
However if you want to use this tool from another program it is better to send the output to a
specific file using -O output.xml
<?xml version='1.0' encoding='utf-8'?>
<v2v-inspection>
<program>virt-v2v-inspector</program>
<package>virt-v2v</package>
<version>2.1.9</version>
The <program>, <package> and <version> elements refer to the current version of virt-v2v-inspector and
are useful for debugging. Make sure you use the same version of virt-v2v-inspector and virt-v2v.
<disks>
<disk index='0'>
<virtual-size>6442450944</virtual-size>
<allocated estimated='true'>1400897536</allocated>
</disk>
<disk index='1'>
<virtual-size>6442450944</virtual-size>
<allocated estimated='true'>45131520</allocated>
</disk>
</disks>
The <disks> element lists information about each guest disk. The example virtual machine above has two
disks. <virtual-size> describes the size of the disk as seen from inside the guest, while <allocated> is
an estimate of how much storage will be needed on the host after conversion. This is assuming you use
-oa sparse - see the notes below.
<operatingsystem>
<name>linux</name>
<distro>fedora</distro>
<osinfo>fedora32</osinfo>
<arch>x86_64</arch>
[...]
</operatingsystem>
The <operatingsystem> element lists information about the guest operating system gleaned during
conversion, in a manner similar to the virt-inspector(1) tool from guestfs-tools.
Output allocation mode and output format
Virt-v2v supports selecting the output allocation mode (-oa option) and output format (-of option, eg.
-of qcow2). Since it is difficult to predict the effect of these options on the actual space occupied by
the final image this tool does not account for them.
As a rule of thumb:
virt-v2v -oa preallocated
causes the disk images on the target to consume their full virtual size (excluding the effect of zero
allocations will depends so much on the underlying storage that it is often hard even for experts to
predict).
virt-v2v -of qcow2
uses the QCOW2 format where supported which means that the apparent size of the file will be equal to
its sparse size, but otherwise should not affect estimates very much.
OPTIONS
--help
Display help.
-O output.xml
Write the output to a file called output.xml.
-O -
Write the output to stdout. This is also the default if the -O option is omitted.
-v
--verbose
Enable verbose messages for debugging.
-V
--version
Display version number and exit.
-x Enable tracing of libguestfs API calls.
-i ...
-ic ...
-if ...
-io ...
-ip ...
-it ...
All of the -i* options supported by virt-v2v and also supported by virt-v2v-inspector.
-b ...
--bridge ...
--colors
--colours
--echo-keys
--key ...
--keys-from-stdin
--mac ...
--machine-readable
--machine-readable=format
-n ...
--network ...
-q
--quiet
--root ...
--wrap
These options work in the same way as the equivalent virt-v2v options.
FILES
Files used are the same as for virt-v2v. See "FILES" in virt-v2v(1).
ENVIRONMENT VARIABLES
Environment variables used are the same as for virt-v2v. See "ENVIRONMENT VARIABLES" in virt-v2v(1).
SEE ALSO
virt-v2v(1), virt-p2v(1), virt-inspector(1), guestfs(3), guestfish(1), qemu-img(1), nbdkit(1),
http://libguestfs.org/.
AUTHORS
Matthew Booth
Cédric Bosdonnat
Laszlo Ersek
Tomáš Golembiovský
Shahar Havivi
Richard W.M. Jones
Roman Kagan
Mike Latimer
Nir Soffer
Pino Toscano
Xiaodai Wang
Ming Xie
Tingting Zheng
COPYRIGHT
Copyright (C) 2009-2022 Red Hat Inc.
LICENSE
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.
BUGS
To get a list of bugs against libguestfs, use this link:
https://bugzilla.redhat.com/buglist.cgi?component=libguestfs&product=Virtualization+Tools
To report a new bug against libguestfs, use this link:
https://bugzilla.redhat.com/enter_bug.cgi?component=libguestfs&product=Virtualization+Tools
When reporting a bug, please supply:
• The version of libguestfs.
• Where you got libguestfs (eg. which Linux distro, compiled from source, etc)
• Describe the bug accurately and give a way to reproduce it.
• Run libguestfs-test-tool(1) and paste the complete, unedited output into the bug report.
virt-v2v-2.4.0 2024-04-01 virt-v2v-inspector(1)