Re: Solution: apt-get (re)install hotplug (was Re: [Xen-devel] Re: Unable to find root device. domU??)

[Nicholas Lee <emptysands@xxxxxxxxx>]

On 10/14/05, Nicholas Lee <emptysands@xxxxxxxxx> wrote:
> No issue running using sda1 for /, which the same device name as  used
> by /boot in dom0.

Actually I spoke to soon:

nic@wuwei:/usr/src/xen/xen-unstable.hg$ sudo fdisk -l /dev/sda

Disk /dev/sda: 73.2 GB, 73272393728 bytes
255 heads, 63 sectors/track, 8908 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1          16      128488+  82  Linux swap / Solaris
/dev/sda2              17          78      498015   83  Linux
/dev/sda3              79         564     3903795   83  Linux
/dev/sda4             565        8908    67023180   8e  Linux LVM


The following works:

disk = [ 'phy:ww/breezy-fs,sda1,w', 'phy:ww/breezy-swap,sda2,w',
'phy:ww/amd64-fs,sda4,w' ]

However sda4 does not exist in domU:

mount: special device /dev/sda4 does not exist

the following does not work:

disk = [ 'phy:ww/breezy-fs,sda1,w', 'phy:ww/breezy-swap,sda2,w',
'phy:ww/amd64-fs,sda3,w' ]

This gives:
VFS: Cannot open root device "sda1" 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)


Changing to sda5 allows both breezy to boot as expected and /dev/sda5
to be mounted in the domU.

--
Nicholas Lee
http://stateless.geek.nz
gpg 8072 4F86 EDCD 4FC1 18EF  5BDD 07B0 9597 6D58 D70C

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