
=head1 名前

virt-v2v-inspector - Estimate disk space needed before virt-v2v conversion

=head1 書式

 virt-v2v-inspector [-i* options] guest [-O output.xml]

=head1 説明

Virt-v2v-inspector is a companion tool for L<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<-i*> options which are the same as virt-v2v.  You should read L<virt-v2v(1)> first.

=head2 Selecting the input guest

You can run virt-v2v-inspector with the same I<-i*> options as virt-v2v. (Don't use any I<-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 F<filename.img> you could do:

 virt-v2v-inspector -i disk filename.img

=head2 Output

The output from this tool is an XML document.

=over 4

=item *

Fields which are annotated with an C<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.

=item *

Numbers representing sizes are always given in bytes.

=item *

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 I<-O output.xml>

=back

 <?xml version='1.0' encoding='utf-8'?>
 <v2v-inspection>
   <program>virt-v2v-inspector</program>
   <package>virt-v2v</package>
   <version>2.1.9</version>

The E<lt>programE<gt>, E<lt>packageE<gt> and E<lt>versionE<gt> 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 E<lt>disksE<gt> element lists information about each guest disk.  The example virtual machine above has two disks.  E<lt>virtual-sizeE<gt> describes the size of the disk as seen from inside the guest, while E<lt>allocatedE<gt> is an estimate of how much storage will be needed on the host after conversion.  This is assuming you use S<I<-oa sparse>> - see the notes below.

   <operatingsystem>
     <name>linux</name>
     <distro>fedora</distro>
     <osinfo>fedora32</osinfo>
     <arch>x86_64</arch>
     [...]
   </operatingsystem>

The E<lt>operatingsystemE<gt> element lists information about the guest operating system gleaned during conversion, in a manner similar to the L<virt-inspector(1)> tool from guestfs-tools.

=head2 Output allocation mode and output format

Virt-v2v supports selecting the output allocation mode (I<-oa> option)  and output format (I<-of> option, eg. S<I<-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:

=over 4

=item S<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).

=item S<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.

=back

=head1 オプション

=over 4

=item B<--help>

ヘルプを表示します。

=item B<-O> F<output.xml>

Write the output to a file called F<output.xml>.

=item B<-O> -

Write the output to stdout.  This is also the default if the I<-O> option is omitted.

=item B<-v>

=item B<--verbose>

デバッグ用の冗長なメッセージを有効にします。

=item B<-V>

=item B<--version>

バージョン番号を表示して、終了します。

=item B<-x>

libguestfs API 呼び出しのトレースを有効にします。

=item B<-i> ...

=item B<-ic> ...

=item B<-if> ...

=item B<-io> ...

=item B<-ip> ...

=item B<-it> ...

All of the I<-i*> options supported by virt-v2v and also supported by virt-v2v-inspector.

=item B<-b> ...

=item B<--bridge> ...

=item B<--colors>

=item B<--colours>

=item B<--echo-keys>

=item B<--key> ...

=item B<--keys-from-stdin>

=item B<--mac> ...

=item B<--machine-readable>

=item B<--machine-readable>=format

=item B<-n> ...

=item B<--network> ...

=item B<-q>

=item B<--quiet>

=item B<--root> ...

=item B<--wrap>

These options work in the same way as the equivalent virt-v2v options.

=back

=head1 ファイル

Files used are the same as for virt-v2v.  See L<virt-v2v(1)/FILES>.

=head1 環境変数

Environment variables used are the same as for virt-v2v.  See L<virt-v2v(1)/ENVIRONMENT VARIABLES>.

=head1 関連項目

L<virt-v2v(1)>, L<virt-p2v(1)>, L<virt-inspector(1)>, L<guestfs(3)>, L<guestfish(1)>, L<qemu-img(1)>, L<nbdkit(1)>, L<http://libguestfs.org/>.

=head1 著者

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

=head1 COPYRIGHT

Copyright (C) 2009-2022 Red Hat Inc.

