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Re: [Xen-users] Questions on qcow, qcow2 versus LVM

To: matt@xxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Questions on qcow, qcow2 versus LVM
From: Grant McWilliams <grantmasterflash@xxxxxxxxx>
Date: Thu, 24 Dec 2009 01:58:36 -0800
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On Thu, Dec 24, 2009 at 1:32 AM, Matthew Law <matt@xxxxxxxxxxxxxxxxxx> wrote:

On Wed, December 23, 2009 4:56 pm, Grant McWilliams wrote:
> I'm going to chime in on the Qcow2 portion of your question - it doesn't
> work. Depending on which version of Xen you have you will have different
> bugs and even if you can get some form of Qcow to work it doesn't support
> a
> backing store so it's basically worthless. I'm considering moving 40 VMs
> to
> KVM just because I ran into a thousand brick walls with Qcow and Xen. I
> want
> to use Xen but at the end of the day I just need to get my work done.

What does kvm buy you? Does it have a working cow backing store?

KVM supports Qcow2 natively. It may be possible to use Qcow2 with a Xen HVM DomU but I've never tried it. Qcow is a part of Qemu and Xen HVM uses a version of Qemu. KVM practically IS QEMU with acceleration.

Grant McWilliams

Some people, when confronted with a problem, think "I know, I'll use Windows."
Now they have two problems.
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