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

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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
> 

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