Re: [Xen-users] Domu has no disks

["Barry Kolts" <bhkolts@xxxxxxxxxxx>]

----- Original Message ----- 
From: "Barry Kolts" <bhkolts@xxxxxxxxxxx>
To: "XEN Mailing List" <xen-users@xxxxxxxxxxxxxxxxxxx>
Sent: Tuesday, October 11, 2011 7:02 PM
Subject: [Xen-users] Domu has no disks


> Hello,
>
> This is my first post to the list and I am new to Xen, so please excuse my 
> ignorance.
> I have Xen 4.0 running on Debian Squeeze with Squeeze as dom0. I am trying 
> to install Ubuntu Lucid 10.04 as a guest. I am using the install cd iso. I 
> think I should be able to do this based on this quote from 
> http://wiki.xensource.com/xenwiki/XenOverview. From the 'Installing new 
> Paravirtual (PV) guests' section, 'Ubuntu 10.04 ("Lucid Lynx") installer 
> can be booted as a Xen PV guest and installed easily that way. '.
> The problem is once the Ubuntu installer starts it cannot find the cdrom. 
> Also if I use the net-install method, the installer can't find the virtual 
> disk to install to. So my problem is not getting domu to boot but not 
> having any disks once it does.
> My domu configuration file is based on the xmexample1 configuration that 
> was packaged with Xen. Rather than posting the whole file here are the 
> changes I made:
> kernel = "/etc/xen/install_kernels/cd-installer/vmlinuz"
> ramdisk = "/etc/xen/install_kernels/cd-installer/initrd.gz"
> builder='linux'
> memory = 512
> name = "Lucid-server-install"
> disk = [ 
> 'file:/home/barry/iso/ubuntu-10.04.3-server-amd64.iso,xvdc:cdrom,r',
> 'tap:aio:/xen-vm-fs/lucid-vm-disk,xvda,w' ]
> root = "/dev/cdrom ro"
>
> The kernel and initrd.gz are copied of the cd iso. In the disk statement I 
> have tried hdc, hda, sda, sdc to no avail.
> I have Googled, searched this list, the debian list, Ubuntu documentation 
> and the Xen.org documentation and not found the answer. Can anyone spot 
> where I've gone wrong? Please ask for more information or suggest how I 
> can debug this problem. One more piece of information, this machine does 
> not have a virtualization process so paravirtual is a must.
> Thanks in advance for any help
> Barry
>
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> http://lists.xensource.com/xen-users
Hi All,

It seems my problem is in the association between a disk in dom0 and the 
virtual disk in domu. Networking seems to work fine. How do I tell if the 
mechanism is working. I guess what I what to know is if blkback and blkfront 
are working, and if not what needs to be installed? I used the package from 
the Debian repository (squeeze) to install xen plus the updated 
xen-utils-common from sid ( to resolve the issue with the missing 
hotplugpath.sh script). Can anyone point me in the right direction?
Thanks in advance,
Barry 

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