Re: starting domain when block device already mounted

[Anthony Liguori <anthony@codemonkey.ws>]

Are you mounting the device within dom0 after creating the domU?  I'm 
not sure there's anything Xend can do about that.

Regards,

James Harper wrote:

>My disks line is:
>
>disk = [ 'phy:vg00/mail,0301,w', 'phy:vg00/mail-swap,0302,w' ]
>
>The unpriv domain is up and running again, although I don't know what
>damage has been done. /etc/passwd was missing though which is not a good
>sign. I found it in /lost+found, but who knows what else is missing!
>
>Thanks
>
>James
>
>  
>
>>-----Original Message-----
>>From: Ian Pratt [mailto:m+Ian.Pratt@cl.cam.ac.uk]
>>Sent: Monday, 17 January 2005 09:34
>>To: James Harper; xen-devel@lists.sourceforge.net
>>Subject: RE: [Xen-devel] starting domain when block device already
>>    
>>
>mounted
>  
>
>>>I just had a filesystem hosed in an unpriv domain (ext3
>>>errors all over
>>>the place), and then when I went to do a fsck on the block device it
>>>told me it was already mounted, and sure enough, dom0 already had
>>>      
>>>
>the
>  
>
>>>device mounted. Would that cause a filesystem crash, or at
>>>least errors?
>>>Dom0 wasn't doing anything to the filesystem, and the unpriv
>>>domain had
>>>been up for a few weeks before this occurred.
>>>      
>>>
>>Mounting an ext3 file system writeable in two domains is almost
>>    
>>
>certain
>  
>
>>to destroy it.
>>
>>The tools try and prevent this. Was it a 'file:' vbd? There's
>>    
>>
>currently
>  
>
>>no safety checks for those, but there should be for physical partition
>>and LVM volumes.
>>
>>Ian
>>
>>    
>>
>>>Anyway, I've done this a few times before by mistake - made a few
>>>changes to the unpriv domain's filesystem from dom0 and forgot to
>>>unmount it before starting the domain. Is there any easy way
>>>to get 'xm
>>>create' to check before starting that none of the block devices it
>>>      
>>>
>is
>  
>
>>>about to export are in use? Such a thing would probably save me
>>>countless headaches in the future! (or maybe it's been done
>>>already? I'm
>>>running 2.0.1)
>>>
>>>Thanks
>>>
>>>James
>>>
>>>
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>>>      
>>>
>
>
>
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