Image files on qcow2 format with KVM

benelux.j · 12-01-2012, 11:43 AM

Hi all,
my KVM, on Centos 6.3, make all virtual machines with .img disk files format.
I would like that KVM is able to make file on .qcow2 format like standard setting.

Is possible, i need to change qemu.conf or other file?

jefro · 12-01-2012, 02:23 PM

I usually start off with building a qcow blank disk and then use it. One could use convert tools also to try to change it from one form or the other. In some cases a pre-allocated drive is better. Sometimes the grow process isn't in time with installers or loaders or such.

dyasny · 12-01-2012, 11:38 PM

.qcow2 or .img doesn't matter, it's just the suffix, not the actual file format.

benelux.j · 12-02-2012, 05:10 AM

Quote:

Originally Posted by dyasny

.qcow2 or .img doesn't matter, it's just the suffix, not the actual file format.

Many thanks, now is all clear

jorton · 12-03-2012, 11:18 AM

KVM was built from Qemu. It should still have the qemu-img program available to convert the format... AND add compression if you desire (-c opt)

I use qemu not KVM but this should work for you.

qemu-img convert -c -O qcow2 jinix.img jinix.qcow