On Sat, May 15, 2010 at 02:00:10AM +0800, lei yang wrote:
>
> I'm confused.. Are you trying to use the _same_ disk for the guest as
> you use for dom0?
> You can't do that.
>
>
> my dom0 use /dev/sda1, can I use domU with second partition /dev/sda2(may
> be it correspond xvda2?)
>
Yes you can.
Or you can use a file in dom0 filesystem. Or you can create LVM volumegroup
and create an LVM volume for the guest.
> if I can't use the second partition, hown do I use "an image file" , how
> to produce a image file, and can I put it in /dev/sda1 to use
>
You can create an empty image file with "dd", for example, or with any another
normal unix/linux tool.
Usually the tool you use to install the guest OS can make guest image files for
you.
> Actually, I don't know what does mean by "disk = ['phy:/dev/sda,xvda,w' ]"
> can you explan it for me
>
It means use xen "phy:" driver for the guest virtual disk, which requires you
to
specify a 'physical' block device in dom0. The block device in question is
"/dev/sda",
and it's mapped to be "/dev/xvda" in the guest. "w" means it's in read/write
mode.
Another options is to use "file:" driver, which enables you to use image files
instead of block devices.
> does virtual disk use the phy disk space in fact?
>
Depends how you set it up.
Also I recommend you to start the guest with "xm create -f /etc/xen/<guest> -c",
which opens up the guest terminal immediately and allows you to see the
guest kernel boot process with all the messages.
-- Pasi
> Thanks
> Lei
>
> You need to have another disk for the guest, or an image file, or lvm
> volume..
> > 4. I create the device by
> > mknod /dev/xvda b 202 0
> > mknod /dev/xvda1 b 202 1
> > when I mount -t ext3 /dev/xvda /
> >
> > [5]root@intel_5500_server:/> mount -t ext3 /dev/xvda /
> > mount: /dev/xvda is not a valid block device
> > does it mean my xvda device driver is not loaded
> >
>
> xvda is the device name in the *guest*, which means the guest kernel
> will see the virtual disk as /dev/xvda.
> -- Pasi
>
> --
> "We learn from failure, not from success!"
>
> References
>
> Visible links
> 1. mailto:pasik@xxxxxx
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