NAME¶
Sys::Virt::StorageVol - Represent & manage a libvirt storage volume
DESCRIPTION¶
The "Sys::Virt::StorageVol" module represents a storage volume managed
by libvirt. A storage volume is always associated with a containing storage
pool ("Sys::Virt::StoragePool").
METHODS¶
- my $name = $vol->get_name()
- Returns a string with a locally unique name of the storage
vol
- my $name = $vol->get_key()
- Returns a string with a globally unique key for the storage
vol
- my $name = $vol->get_path()
- Returns a string with a locally unique file path of the
storage vol
- my $xml = $vol->get_xml_description()
- Returns an XML document containing a complete description
of the storage vol's configuration
- $vol->delete($flags)
- Immediately delete the storage volume freeing its storage
resources. The "flags" parameter indicates any special action to
be taken when deleting the volume.
- $vol->resize($newcapacity, $flags=0)
- Adjust the size of the storage volume. The $newcapacity
value semantics depend on the $flags parameter. If $flags specifies
"RESIZE_DELTA" then the $newcapacity is relative to the current
size. If $flags specifies "RESIZE_SHRINK" then the $newcapacity
value is the amount of space to remove
- $vol->wipe($flags = 0)
- Clear the data in the storage volume to avoid future
information leak. The "flags" parameter is currently unused and
defaults to zero.
- $vol->wipe_pattern($algorithm, $flags = 0)
- Clear the data in the storage volume to avoid future
information leak. The $algorithm parameter specifies the data pattern used
to erase data, and should be one of the WIPE ALGORITHM CONSTANTS listed
later. The "flags" parameter is currently unused and defaults to
zero.
- my $info = $vol->get_info()
- Retrieve live information about the storage volume. The
returned $info hash reference contains three keys. "type"
indicates whether the volume is a file or block device.
"capacity" provides the maximum logical size of the volume.
"allocation" provides the current physical usage of the volume.
The allocation may be less than the capacity for sparse, or grow-on-demand
volumes. The allocation may also be larger than the capacity, if there is
a metadata overhead for the volume format.
- $vol->download($st, $offset, $length);
- Download data from $vol using the stream $st. If $offset
and $length are non-zero, then restrict data to the specified volume byte
range.
- $vol->upload($st, $offset, $length);
- Upload data to $vol using the stream $st. If $offset and
$length are non-zero, then restrict data to the specified volume byte
range.
CONSTANTS¶
The following sets of constants are useful when dealing with storage volumes
VOLUME TYPES¶
The following constants are useful for interpreting the "type" field
in the hash returned by the "get_info" method
- Sys::Virt::StorageVol::TYPE_FILE
- The volume is a plain file
- Sys::Virt::StorageVol::TYPE_BLOCK
- The volume is a block device
- Sys::Virt::StorageVol::TYPE_DIR
- The volume is a directory
DELETE MODES¶
The following constants are useful for the "flags" parameter of the
"delete" method
- Sys::Virt::StorageVol::DELETE_NORMAL
- Do a plain delete without any attempt to scrub data.
- Sys::Virt::StorageVol::DELETE_ZEROED
- Zero out current allocated blocks when deleteing the
volume
WIPE ALGORITHM CONSTANTS¶
The following constants specify the algorithm for erasing data
- Sys::Virt::StorageVol::WIPE_ALG_BSI
- 9-pass method recommended by the German Center of Security
in Information Technologies
- Sys::Virt::StorageVol::WIPE_ALG_DOD
- 4-pass Dod 5220.22-M section, 8-306 procedure
- Sys::Virt::StorageVol::WIPE_ALG_GUTMANN
- The canonical 35-pass sequence
- Sys::Virt::StorageVol::WIPE_ALG_NNSA
- 4-pass NNSA Policy Letter NAP-14.1-C (XVI-8)
- Sys::Virt::StorageVol::WIPE_ALG_PFITZNER7
- 7-pass random
- Sys::Virt::StorageVol::WIPE_ALG_PFITZNER33
- 33-pass random
- Sys::Virt::StorageVol::WIPE_ALG_RANDOM
- 1-pass random
- Sys::Virt::StorageVol::WIPE_ALG_SCHNEIER
- 7-pass method described by Bruce Schneier in "Applied
Cryptography" (1996)
- Sys::Virt::StorageVol::WIPE_ALG_ZERO
- 1-pass, all zeroes
VOLUME RESIZE CONSTANTS
The following constants control how storage volumes can be resized
- Sys::Virt::StorageVol::RESIZE_ALLOCATE
- Fully allocate the extra space required during resize
- Sys::Virt::StorageVol::RESIZE_DELTA
- Treat the new capacity as a delta to the current
capacity
- Sys::Virt::StorageVol::RESIZE_SHRINK
- Treat the new capacity as an amount to remove from the
capacity
AUTHORS¶
Daniel P. Berrange <berrange@redhat.com>
COPYRIGHT¶
Copyright (C) 2006-2009 Red Hat Copyright (C) 2006-2009 Daniel P. Berrange
LICENSE¶
This program is free software; you can redistribute it and/or modify it under
the terms of either 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), or, the Artistic License, as specified in the Perl README
file.
SEE ALSO¶
Sys::Virt, Sys::Virt::Error, "
http://libvirt.org"