Re: [Xen-devel] Bugs with block devices to domU - let's find solution

[Ewan Mellor <ewan@xxxxxxxxxxxxx>]

On Tue, Oct 18, 2005 at 09:06:51PM +0400, Guryanov Dmitry wrote:

> Hello
> 
> I have the same bug, that've been disscussed before - domU can't find 
> any block devices and crashes with "Unable to mount root fs". I've spend 
> a week under heavy debugging and find, that this bug take place because 
> dom0 backend driver can't read parameter physical-device from xenstore. 
> For example /local/domain/0/backend/vbd/1/776/physical_device, where  1- 
> domU id, 776=0x308 - major and minor numbers of block device, which will 
> used by domU.
> This parameter must be written by script /etc/xen/scripts/block, which 
> must start like /etc/xen/scripts/vif-bridge any time as domU starts, but 
> it doesn't.
> 
> So, there is a question to xen developers: when and how must this script 
> must been started ?

This script is run by your hotplug / udev installation inside dom0 when the
domU starts up.  Do you have hotplug and udev installed in dom0?

Ewan.


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