Re: qcow2 corruption?

John Morrissey
2009-01-08T20:16:18Z

On Thu, Jan 08, 2009 at 02:10:31PM -0600, Ryan Harper wrote:
> * John Morrissey <jwm@horde.net> [2009-01-08 13:28]:
> > I'm encountering what seems like disk corruption when using qcow2 images,
> > created with 'kvm-img create -f qcow2 image.qcow2 15G'.
>
> using ide or scsi as your block device?

IDE.

> > A simple test case is to use the Debian installer (I'm using the lenny
> > rc1 images from http://www.debian.org/devel/debian-installer/) to
> > install a new domain. The qcow2 file on disk grows due to the mkfs(8)
> > activity, then the installer faults while trying to mount the root
> > filesystem (Invalid argument). 'fdisk -l' shows that the partition table
> > just created by the installer is gone.
> >
> > In a few cases, I've managed to finish an installation, but the resulting
> > filesystem is strangely corrupt:
> >
> > # file /usr/bin/w.procps
> > /usr/bin/w.procps: gzip compressed data, was "aptitude.8", from Unix, last modified: Wed Mar 14 14:11:18 2007, max compression
>
> If you are using ide and getting corruption, try again but with creating
> a disk image with the raw format:
>
> qemu-img create -f raw <imagename> <size>
>
> That should help track down where the corruption is coming from.

raw images are fine. (Sorry, should've mentioned that in the first place.)