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Re: [Qemu-devel] booting from /dev/hd?
From: |
Antony T Curtis |
Subject: |
Re: [Qemu-devel] booting from /dev/hd? |
Date: |
Mon, 31 May 2004 18:16:37 +0100 |
On Mon, 2004-05-31 at 18:10, Tim wrote:
> Hello,
>
> I know it is considered dangerous, but I am willing to accept the
> risk... Has anyone been able to boot a virtual machine from their main
> boot drive while the drive is in use?
Yes, but I made a COW image from the hard drive so I don't trash the
hard drive for real.
> More specifically, I have a dual boot system, win2k/debian, and I would
> like to try booting windoze from this disk as a guest OS while running
> the linux system from this same disk. In order to protect my disk from
> erroneous writes, I planned on running the vm system with -snapshot.
>
> I have tried this, and with basic options:
>
> qemu -hda /dev/hda -snapshot -boot c
>
> my bootloader (grub) comes up just fine, but once I select win2k, it
> reports a disk read error. When booting Debian, it loads the kernel and
> tries to begin booting, but just hangs. This may be because my kernel
> is customized for my Athlon though...
> I figured the windoze issue might be a geometry problem, so I ran
> `fdisk -l /dev/hda' and then used that geometry:
>
> qemu -hda /dev/hda -snapshot -boot c -hdachs 4865,255,63
>
> and I get the same results. Perhaps I need to use a non-LBA geometry or
> something? I really don't know much about disk geometry, just a
> guess...
Try to do it with LBA Compat geometry.... -hdachs 77536,16,63 in your
case...
>
> Has anyone tried doing something similar to what I am attempting? If
> so, did you have any success, and what did you try that I haven't? I am
> pretty sure I have permissions right in the host OS, is there anything I
> am forgetting?
>
> thanks,
> tim
>
>
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--
Antony T Curtis <address@hidden>