Re: Bugs with block devices to domU - let's find solution

[Guryanov Dmitry <dimak@dgap.mipt.ru>]

Ewan Mellor wrote:

>On Tue, Oct 18, 2005 at 09:06:51PM +0400, Guryanov Dmitry wrote:
>
>  
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>>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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>
Thanks, that's was a bug, now it works properly.

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