Xen users - Apr 2011 - debian lenny -> squeeze domU migration /dev/sdaX not found

I''m migrating a Lenny/2.6.26-1 kernel non-lvm file based DomU to a new
Squeeze Dom0 server (non-lvm hardware RAID1 sdX) running kernel
2.6.32-5-xen-amd64, xen-hypervisor-4.0-amd64, xen-tools 4.2-1. When I do

xm create whatever.domain.com.cfg

it starts, but then when I login with xm console I get:

Begin: Loading essential drivers ... done.
Begin: Running /scripts/init-premount ... done.
Begin: Mounting root file system ... Begin:
Running /scripts/local-top ... done.
Begin: Waiting for root file system ... done.
Gave up waiting for root device.  Common problems:
 - Boot args (cat /proc/cmdline)
   - Check rootdelay= (did the system wait long enough?)
   - Check root= (did the system wait for the right device?)
 - Missing modules (cat /proc/modules; ls /dev)
ALERT!  /dev/sda2 does not exist.  Dropping to a shell!
BusyBox v1.17.1 (Debian 1:1.17.1-8) built-in shell (ash)
Enter ''help'' for a list of built-in commands.
/bin/sh: can''t access tty; job control turned off
(initramfs)

apparently it can''t find /dev/sda2, which is specified in
whatever.domain.cfg as:

root        = ''/dev/sda2 ro''
disk        = [

''file:/home/xen/domains/whatever.domain.com/swap.img,sda1,w'',
''file:/home/xen/domains/whatever.domain.com/disk.img,sda2,w'',
              ]

along with updated kernel entries like:

kernel      = ''/boot/vmlinuz-2.6.32-5-xen-amd64''
ramdisk     = ''/boot/initrd.img-2.6.32-5-xen-amd64''
#kernel      = ''/boot/vmlinuz-2.6.26-1-xen-amd64''
#ramdisk     = ''/boot/initrd.img-2.6.26-1-xen-amd64''

also, 

/home/xen/domains/whatever.domain.com/disk.img and swap.img

exist and have the same ownership/permissions as a newly created
(successful) DomU on this same box using Debian Squeeze xen-tools, which
is working fine.

why can''t the old DomU see /dev/sda2
as /home/xen/domains/whatever.domain.com/disk.img ? Is there something I
can edit at xm console inside DomU to make it see those .img''s?
I''ve
tried mount, but don''t see the fs, and fdisk -l doesn''t work.

thx,
Cam



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--- On Fri, 4/22/11, Cameron Camp <cameron@campworkz.com> wrote:
> From: Cameron Camp <cameron@campworkz.com>
> Subject: [Xen-users] debian lenny -> squeeze domU migration /dev/sdaX
not found
> To: xen-users@lists.xensource.com
> Date: Friday, April 22, 2011, 10:55 AM
> I''m migrating a Lenny/2.6.26-1 kernel
> non-lvm file based DomU to a new
> Squeeze Dom0 server (non-lvm hardware RAID1 sdX) running
> kernel
> 2.6.32-5-xen-amd64, xen-hypervisor-4.0-amd64, xen-tools
> 4.2-1. When I do
> 
> xm create whatever.domain.com.cfg
> 
> it starts, but then when I login with xm console I get:
in domU config 

/dev/sda -> /dev/xvda

in domU: fstab and menu.lst 

/dev/sda -> /dev/xvda

(or use extra = "" and append to vmlinuz)

-- 
Mark

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> in domU config 
> 
> /dev/sda -> /dev/xvda
> 
> in domU: fstab and menu.lst 
> 
> /dev/sda -> /dev/xvda
> 
> (or use extra = "" and append to vmlinuz)
> 
works! All I needed to do was change:

/etc/xen/whatever.domain.com.cfg

#root        = ''/dev/sda2 ro''
root        = ''/dev/xvda2 ro''

then xm create whatever.domain.com.cfg

xm console whatever.domain.com

vi /etc/apt/sources.list

:%s/lenny/squeeze/g

apt-get update && apt-get upgrade
apt-get dist-upgrade

and now it''s Squeeze running the right kernel! Sometimes I get an
"out
memory" error still, is this related to the original issue, or something
else? Hope this post helps someone else.

thx,
Cam





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