Re: [Xen-devel] ttylinux unable to mount root fs on gentoo

[Steven Hand <Steven.Hand@xxxxxxxxxxxx>]

>Yes, /dev/sda1 does exist in dom0:
>
>l500r root # ls -l /dev/sda1
>brw-rw----  1 root disk 8, 1 Oct 23 23:28 /dev/sda1
>l500r root #
>
>This box was setup as a "tweaked" udev box per the instructions in sections 1 
>and 2 of:
>
>http://www.gentoo.org/doc/en/udev-guide.xml
>
>It seems that the gentoo init scripts detect this configuration and construct 
>a set of devices early in the boot then start udevd (still running).
>
> Using 0801 instead of /dev/sda1 yields the following for both the file and 
>lvm disk:
>
>VFS: Cannot open root device "0801" or unknown-block(8,1)
>Please append a correct "root=" boot option
>Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,1)

Interesting - this message means what it says, viz.\ the guest kernel has 
no idea about the device 0801 (/dev/sda1). It should have received info about
this via the control interface during boot -- what does /var/log/xend.log or 
/var/log/xend-debug.log in domain0 say? (it may be useful to "tail -f" one or
both of them during the guest boot). Do you see "xen_blk: Initializing virtual 
block device driver" on the guest console during boot? 

cheers,

S.


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