sunshout2@choonho:~/opensource/qemu$ qemu-img create -f qcow2 a.img 1G
Formatting 'a.img', fmt=qcow2 size=1073741824 encryption=off cluster_size=65536 lazy_refcounts=off
sunshout2@choonho:~/opensource/qemu$ qemu-img info a.img
image: a.img
file format: qcow2
virtual size: 1.0G (1073741824 bytes)
disk size: 196K
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: false
빈 qcow2 디스크를 생성하면 3개의 cluster로 구성된 파일이 생성된다.
img_create call sequence
Qcow2 Disk layout
QCOW2Cache
참조:
https://people.gnome.org/~markmc/qcow-image-format.html
qcow2 => http://www.linux-kvm.org/wiki/images/6/63/2011-forum-qcow2.pdf
FVD: a High-Performace Virtual Machine Image Format for Cloud, Usenix ATC11
- https://www.usenix.org/legacy/event/atc11/tech/final_files/Tang.pdf