domU crashing with no root

domU crashing with no root

[Rob Gardner]

Has something in domU configuration changed recently... Lately I have 
not been able to get domU to boot successfully. My (condensed) config 
file looks like this:
kernel = "/boot/vmlinuz-2.6.12-xenU"
memory = 128
name = "Rob-VM%d" % vmid
cpu = -1   # leave to Xen to pick
vcpus = 1
nics=1
disk = [ 'file:/xen/disk-images/dom1.fs,sda1,w']
ip = add_offset_to_ip(get_current_ipaddr(),vmid)
netmask = get_current_ipmask()
gateway = get_current_ipgw()
hostname= "vm%d" % vmid
root = "/dev/sda1 ro"
extra = "4 VMID=%d" % vmid

And when I start the domain, I get the following boot messages:

IP-Config: Complete:
      device=eth0, addr=15.9.73.171, mask=255.255.248.0, gw=15.9.72.1,
     host=vm1, domain=, nis-domain=(none),
     bootserver=1.2.3.4, rootserver=1.2.3.4, rootpath=
Looking up port of RPC 100003/2 on 1.2.3.4
portmap: server 1.2.3.4 not responding, timed out
Root-NFS: Unable to get nfsd port number from server, using default
Looking up port of RPC 100005/1 on 1.2.3.4
portmap: server 1.2.3.4 not responding, timed out
Root-NFS: Unable to get mountd port number from server, using default
mount: server 1.2.3.4 not responding, timed out
Root-NFS: Server returned error -5 while mounting /tftpboot/vm1
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "sda1" or unknown-block(2,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on 
unknown-block(2,0)


I don't get it. This worked in the past. I want to boot from a loopback 
file, not an nfs server. Why does it think there is no sda1?

Thanks for any help.

Rob

Re: domU crashing with no root

[Vincent Hanquez]

On Mon, Oct 10, 2005 at 04:49:11PM -0600, Rob Gardner wrote:
> And when I start the domain, I get the following boot messages:
> 
> I don't get it. This worked in the past. I want to boot from a loopback 
> file, not an nfs server. Why does it think there is no sda1?

It's likely the blockdevice frontend didn't found any devices.
make sure you have hotplug in dom0 and that you installed xen's hotplug
files.

but the log you attached is missing important informations printed
before this part, so it may be something else.

-- 
Vincent Hanquez