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Re: [Qemu-devel] Are VM snapshots on Ubuntu host compatible with Fedora

From: David Barrett
Subject: Re: [Qemu-devel] Are VM snapshots on Ubuntu host compatible with Fedora host?
Date: Mon, 31 Mar 2008 19:47:42 -0700
User-agent: Thunderbird (X11/20080227)

Anthony Liguori wrote:
David Barrett wrote:
Following up on this, I created a brand-new WinXP image from scratch (on my Ubuntu box), uploaded to my headless Fedora box, and it still has the exact same crash:

qemu: warning: error while loading state for instance 0x0 of device 'ram'
qemu: fatal: triple fault

So is it safe to say that QEMU VM snapshots are not transferable between hosts?

KVM images are not compatible with QEMU. If one of your servers is running KVM, that's likely your problem.

Ahh, very interesting.

Just to make sure I understand correctly, this means VM snapshots made when QEMU has KQEMU enabled will not transfer between machines, right?

Or do you mean that the *whole image* (the entire qcow2) cannot be transferred?

I ask because now that I've got VNC working on my headless server, I note that my XP guest -- despite being started from a binary identical image that works fine on my Ubuntu host -- immediately and infinitely BSoDs on startup.

I assumed (perhaps incorrectly) that the same QEMU XP image would work across multiple hosts, even those with different processors and motherboards. Am I misunderstanding this?

(Just for grins I even converted the qcow2 image to raw, to filter out any special qcow2 issues. No effect.)


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