Xen users - Mar 2010 - Installation error: partition does not exist

We compiled xen-3.4.2 (2.6.18.8-xen).
The grub entry, and the partition information to boot from /dev/sda1 is as
follows.


1. /boot/grub/menu.lst:

title           Xen
uuid            30ec981c-187e-4488-ae98-fe54ad13a77b
kernel          /boot/xen-3.4.gz console=vga
module          /boot/vmlinuz-2.6.18.8-xen
root=UUID=30ec981c-187e-4488-ae98-fe54ad13a77b ro console=tty0 rootdelay=90
module          /boot/initrd-2.6.18.8-xen.img


2. fdisk:

Disk /dev/sda: 122.9 GB, 122942324736 bytes
255 heads, 63 sectors/track, 14946 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000e4ad4

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        1376    11052688+  83  Linux
/dev/sda2           14335       14946     4915890    5  Extended
/dev/sda3            1377       11587    82019857+  83  Linux
/dev/sda4           11588       14334    22065277+   7  HPFS/NTFS
/dev/sda5           14335       14946     4915858+  82  Linux swap / Solaris

Partition table entries are not in disk order


3. /etc/fstab:

# /dev/sda1
UUID=30ec981c-187e-4488-ae98-fe54ad13a77b /               ext3   
relatime,errors=remount-ro 0       1
# /dev/sda5
UUID=3896c65c-3908-412d-8d3d-e5593a6e674e none            swap    sw
0       0


4. /dev/disk/by-uuid/:

total 0
lrwxrwxrwx 1 root root 10 2010-03-01 14:43 1385D7DA6D83F67F -> ../../sda4
lrwxrwxrwx 1 root root 10 2010-03-01 14:43
30ec981c-187e-4488-ae98-fe54ad13a77b -> ../../sda1
lrwxrwxrwx 1 root root 10 2010-03-01 14:43
3896c65c-3908-412d-8d3d-e5593a6e674e -> ../../sda5
lrwxrwxrwx 1 root root 10 2010-03-01 14:43
6c4a7894-1a6a-46b7-b020-7a3cfa859283 -> ../../sda3


When we boot the new Xen kernel, we get the messsage:
ALERT! /dev/disk/.......does not exist. Dropping to a shell!

We tried several other settings for "root=" in the menu.lst such as
root=/dev/sda1, etc.
But none of them worked. We kept getting the same error message "..... does
not exist". 

Can somebody figure out why does this happen? Thanks a lot in advance!

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On Tue, Mar 2, 2010 at 7:52 AM, Teng Lu <tai_xian@hotmail.com>
wrote:
>
> We compiled xen-3.4.2 (2.6.18.8-xen).
> ALERT! /dev/disk/.......does not exist. Dropping to a shell!
>
> We tried several other settings for "root=" in the menu.lst such
as
> root=/dev/sda1, etc.
> But none of them worked. We kept getting the same error message ".....
does
> not exist".
>
> Can somebody figure out why does this happen? Thanks a lot in advance!
2.6.18 should recognize IDE disk as hda. Try "cat /proc/partitions"
after dropping to shell. That will show how the kernel identifies the
disk. Also look at boot messages, search for "sda", "hda",
or "ide".

-- 
Fajar

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