Glossary

AES encryption

Advanced Encryption Standard - very fast and secure; the de facto standard for symmetric encryption.

See Also zlib compression.

ASCII

American Standard Code for Information Interchange. It is a 7-bit code. ASCII encodes characters as you would enter them into a computer (like this book)

Backing image

A (typically) read-only disk image which can be used as a starting point for new read-write images.

See Also Snapshot.

Base-image

Placeholder.

See Also Backing image, Snapshot.

block

block special

Caret notation

cat

A utility program which concatenates files and print them the standard output.

Control character

cylinder

dd

A utility program which can copy files, converting and formatting them according to the options given by the user.

Device map

Software which creates devices from partition tables which you can interact with.

See Also Partition table, kpartx, GParted, Partition.

dev null

dev zero

fdisk

A utility program which manipulates disk partition tables.

See Also Partition, Partition table.

file

A utility program which is used to determine file types

Filesystem

fuse

GParted

A graphical application used for manipulating (creating, resizing, moving, copying) the filesystems of partitions.

Guest OS

An operating system which is installed and ran on emulatd, virtual, or paravirtual hardware which is managed by hypervisor software on the Host OS.

See Also Hypervisor, Host OS.

head

Host OS

The running system (server, OS) which provides resources and facilities for running several virtual Guest Operating Systems.

See Also Guest OS.

Hypervisor

Software blabla.

IDE

Image

A file which virtualization software can use as a hard disk, similar to a snapshot.

See Also Snapshot.

kpartx

Reads partition tables on a specified device and create device maps over partition segments detected.

See Also Partition.

Lookback device

Loop device

losetup

A utility program which sets up and controls loop devices.

See Also Loop device, .

ls

A command which lists directory contents and file attributes.

LVM

MBR

The Master Boot Record holds the information on how the logical partitions, containing file systems, are organized on a storage device.

See Also Partition, Partition table.

meta-data

Data which describes other data; e.g., virtual disk configuration parameters.

mount

A utility program which attaches a filesystem to a directory tree.

See Also umount, Filesystem.

NUL

offset

OS

Short for Operating System.

parted

Utility program which manipulates storage partitions

See Also fdisk.

Partition

In storage devices, the definition of storage allocation on a device; the capacity of that region is less than or equal to that of the backing storage device; multiple partitions may exist.

Partition table

Meta-data stored on a storage volume which describes the partition layout, i.e., begin/end locations, types, and other properties.

See Also Device map, kpartx, GParted, Partition, meta-data.

QCOW2

QEMY Copy On Write image format (version 2); improves v1 with few features: snapshots, performance tuning options.

QCOW

QEMU Copy On Write image format (version 1); supports sparse files, backing files, and encryption.

qemu-img

Virtual disk manipulation tool bundled with the QEMU (Quick Emulator) software collection.

RAW

The simplest type of virtual disk format, as the file contains no extra meta-data about itself, often usable without requiring special software.

See Also QCOW, QCOW2, meta-data.

resize2fs

Utility program which can resize ext2, ext3, or ext4 file systems.

SATA

sector

Snapshot

An virtual disk feature representing a moment in time, not represented as a disk image.

See Also Backing image, Base-image.

socket

stat

See Also ???TITLE???.

superuser

symlink

UNIX

umount

Utility program which detaches the file system(s) mentioned from the file hierarchy.

See Also mount.

virsh

x86 boot sector

zlib compression

general-purpose, patent-free, lossless data compression library.

See Also AES encryption.