Fedora xen - Feb 2007 - DomU boot on Fedora 6 fails with ''VFS: Cannot open root device''

Hello

I have got a problem booting a DomU on Linux Fedora Core 6 (kernel 
2.6.19-1.2895.fc6xen)

I did the following operations :

1) dd if=/dev/zero of=/home/xen/vm1 bs=1k seek=6144k count=1

2) mkfs.ext3 /home/xen/vm1

3) mount -o loop /home/xen/vm1 /mnt

4) cp -ax /{root,dev,var,etc,usr,bin,sbin,lib,boot} /mnt
5) mkdir -m 755 /mnt/{proc,sys,home,tmp,mnt}

6) DomU fstab :
/dev/sdb1               /                       ext3    defaults        1 1
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
tmpfs                   /dev/shm                tmpfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
sysfs                   /sys                    sysfs   defaults        0 0


7) cat > /etc/xen/vm1
kernel = "/boot/vmlinuz-2.6.19-1.2895.fc6xen"
memory = 512
name = ''vm1''
vif = [ '''' ]
disk = [ ''file:/home/xen/vm1,sdb1,w'' ]
root = ''/dev/sdb1 ro''
extra = ''ro selinux=0 3''

8) When I launch :
xm create -c vm1

I get the following error message :
----
VFS: Cannot open root device "sdb1" or unknown-block(0,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on 
unknown-block(0,0)
----

I tried several devices but I got the same message

Any advice ?

Thanks in advance.

Anne Facq

Hi

Thanks to Sadique Puthen, here is the solution to my problem :
- create an initrd image with  --with=xennet --preload=xenblk options
- specify that using "ramdisk = <path to initrd>" in the
configuration
file for guest.

Anne Facq wrote:
> Hello
> 
> I have got a problem booting a DomU on Linux Fedora Core 6 (kernel 
> 2.6.19-1.2895.fc6xen)
> 
> I did the following operations :
> 
> 1) dd if=/dev/zero of=/home/xen/vm1 bs=1k seek=6144k count=1
> 
> 2) mkfs.ext3 /home/xen/vm1
> 
> 3) mount -o loop /home/xen/vm1 /mnt
> 
> 4) cp -ax /{root,dev,var,etc,usr,bin,sbin,lib,boot} /mnt
> 5) mkdir -m 755 /mnt/{proc,sys,home,tmp,mnt}
> 
> 6) DomU fstab :
> /dev/sdb1               /                       ext3    defaults        1 1
> devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
> tmpfs                   /dev/shm                tmpfs   defaults        0 0
> proc                    /proc                   proc    defaults        0 0
> sysfs                   /sys                    sysfs   defaults        0 0
> 
> 
> 7) cat > /etc/xen/vm1
> kernel = "/boot/vmlinuz-2.6.19-1.2895.fc6xen"
> memory = 512
> name = ''vm1''
> vif = [ '''' ]
> disk = [ ''file:/home/xen/vm1,sdb1,w'' ]
> root = ''/dev/sdb1 ro''
> extra = ''ro selinux=0 3''
> 
> 8) When I launch :
> xm create -c vm1
> 
> I get the following error message :
> ----
> VFS: Cannot open root device "sdb1" or unknown-block(0,0)
> Please append a correct "root=" boot option
> Kernel panic - not syncing: VFS: Unable to mount root fs on 
> unknown-block(0,0)
> ----
> 
> I tried several devices but I got the same message
> 
> Any advice ?
> 
> Thanks in advance.
> 
> Anne Facq
>