Bienvenido! - Willkommen! - Welcome!

Bitácora Técnica de Tux&Cía., Santa Cruz de la Sierra, BO
Bitácora Central: Tux&Cía.
Bitácora de Información Avanzada: Tux&Cía.-Información
May the source be with you!

Wednesday, November 21, 2012

QEMU Copy On Write

Developed by QEMU
Type of format Disk image
Container for File system
qcow stands for "QEMU Copy On Write" and denotes a disk storage optimization strategy that delays allocation of storage until it is actually needed. QEMU is an emulator and virtual machine container, and it can use a variety of virtual disk images which are generally associated with specific guests operating systems.
Jump to: navigation, search
Once QEMU has been installed, it should be ready to run a guest OS from a disc image. This image is a file that represents the data on a hard disc. From the perspective of the guest OS, it actually is a hard disc, and it can create its own filesystem on the virtual disc.
You can download a few guest OS images from the QEMU website, including a simple 8MB image of a Linux distro. To run it, download and unzip the image in a folder and run the QEMU command.
qemu linux-0.2.img
Replace linux-0.2.img with the name of your guest OS image file. If it has a GUI and you want to use your mouse with it, double-click on the window and QEMU will grab your mouse. To make QEMU release your mouse again, hold down the Control and Alt keys simultaneously, then let go - your mouse will be released back to X.
Aurélien Jarno of Debian has prepared a number of pre-packaged Debian qemu images for several architectures, including ARM, Sparc, PowerPC, x86_64, and i386. They can be found at

No comments: