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virt-format(1)			      Virtualization Support			   virt-format(1)

NAME
       virt-format - Erase and make a blank disk

SYNOPSIS
	virt-format [--options] -a disk.img [-a disk.img ...]

DESCRIPTION
       Virt-format takes an existing disk file (or it can be a host partition, LV etc), erases
       all data on it, and formats it as a blank disk.	It can optionally create partition
       tables, empty filesystems, logical volumes and more.

       To create a disk containing data, you may be better to use virt-make-fs(1).  If you are
       creating a blank disk to use in guestfish(1), you should instead use the guestfish -N
       option.

       Normal usage would be something like this:

	virt-format -a disk.qcow

       or this:

	virt-format -a /dev/VG/LV

       "disk.qcow" or "/dev/VG/LV" must exist already.	Any data on these disks will be erased by
       these commands.	These commands will create a single empty partition covering the whole
       disk, with no filesystem inside it.

       Additional parameters can be used to control the creation of partitions, filesystems, etc.
       The most commonly used options are:

       --filesystem=[ext3|ntfs|vfat|...]
	   Create an empty filesystem ("ext3", "ntfs" etc) inside the partition.

       --lvm[=/dev/VG/LV]
	   Create a Linux LVM2 logical volume on the disk.  When used with --filesystem, the
	   filesystem is created inside the LV.

       For more information about these and other options, see "OPTIONS" below.

       The format of the disk is normally auto-detected, but you can also force it by using the
       --format option (q.v.).	In situations where you do not trust the existing content of the
       disk, then it is advisable to use this option to avoid possible exploits.

OPTIONS
       --help
	   Display brief help.

       -a file
       --add file
	   Add file, a disk image, host partition, LV, external USB disk, etc.

	   The format of the disk image is auto-detected.  To override this and force a
	   particular format use the --format=.. option.

	   Any existing data on the disk is erased.

       -a URI
       --add URI
	   Add a remote disk.  See "ADDING REMOTE STORAGE" in guestfish(1).

       --filesystem=ext3|ntfs|vfat|...
	   Create an empty filesystem of the specified type.  Many filesystem types are supported
	   by libguestfs.

       --filesystem=none
	   Create no filesystem.  This is the default.

       --format=raw|qcow2|..
       --format
	   The default for the -a option is to auto-detect the format of the disk image.  Using
	   this forces the disk format for -a options which follow on the command line.  Using
	   --format with no argument switches back to auto-detection for subsequent -a options.

	   For example:

	    virt-format --format=raw -a disk.img

	   forces raw format (no auto-detection) for "disk.img".

	    virt-format --format=raw -a disk.img --format -a another.img

	   forces raw format (no auto-detection) for "disk.img" and reverts to auto-detection for
	   "another.img".

	   If you have untrusted raw-format guest disk images, you should use this option to
	   specify the disk format.  This avoids a possible security problem with malicious
	   guests (CVE-2010-3851).

       --label=LABEL
	   Set the filesystem label.

       --lvm=/dev/VG/LV
	   Create a Linux LVM2 logical volume called "/dev/VG/LV".  You can change the name of
	   the volume group and logical volume.

       --lvm
	   Create a Linux LVM2 logical volume with the default name ("/dev/VG/LV").

       --lvm=none
	   Create no logical volume.  This is the default.

       --partition
	   Create either an MBR or GPT partition covering the whole disk.  MBR is chosen if the
	   disk size is < 2 TB, GPT if >= 2 TB.

	   This is the default.

       --partition=gpt
	   Create a GPT partition.

       --partition=mbr
	   Create an MBR partition.

       --partition=none
	   Create no partition table.  Note that Windows may not be able to see these disks.

       -v
       --verbose
	   Enable verbose messages for debugging.

       -V
       --version
	   Display version number and exit.

       --wipe
	   Normally virt-format does not wipe data from the disk (because that takes a long
	   time).  Thus if there is data on the disk, it is only hidden and partially overwritten
	   by virt-format, and it might be recovered by disk editing tools.

	   If you use this option, virt-format writes zeroes over the whole disk so that previous
	   data is not recoverable.

       -x  Enable tracing of libguestfs API calls.

EXIT STATUS
       This program returns 0 on success, or 1 on failure.

SEE ALSO
       guestfs(3), guestfish(1), virt-filesystems(1), virt-make-fs(1), virt-rescue(1),
       virt-resize(1), http://libguestfs.org/.

AUTHOR
       Richard W.M. Jones http://people.redhat.com/~rjones/

COPYRIGHT
       Copyright (C) 2012 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:

       o   The version of libguestfs.

       o   Where you got libguestfs (eg. which Linux distro, compiled from source, etc)

       o   Describe the bug accurately and give a way to reproduce it.

       o   Run libguestfs-test-tool(1) and paste the complete, unedited output into the bug
	   report.

libguestfs-1.22.6			    2013-08-24				   virt-format(1)
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