Re: [Xen-devel] Cannot create domain with lvm rootfs

[Scott Mohekey <smohekey@xxxxxxxxxxxxxxxx>]

Mark Williamson wrote:

> Hi there,
>
>  
>
> > Using config file "/etc/xen/db1".
> > Error: Error creating domain: vbd: Segment not found: uname=phy:fs/db1
> >    
> * Can you confirm the device node is really present before and after the 
> failure to start the domain?
>  
The device node is present both before and after the failed start attempt.

> * Can you mount the device in domain 0 before and after the failure to start 
> the domain?
>  
I can no longer do either. I've tried rebooting and it makes no difference.

> > However, if I reset the machine, this problem appears to go away for a
> > time, only to be replaced with another. The domain is started, but in the
> > log files it is noted that it is restarted over and over until xend
> > complains that it's been restarting too fast and stops trying.
> >    
> Sounds like Xend is finding the VBD device node when building the domain but 
> that the domain kernel is bailing out for some reason after being started.  
> Given your other problems, I'd speculate it can't mount its root filesystem 
> and so is repeatedly rebooting.
>  
I thought this might be the case, however the time between restarts 
appeared to be very small, i.e. in a period of about a minute, it tried 
to restart the domain at least 10 times.
At the moment, it appears I'm having a problem with LVM2.
/dev/fs/db1 is a symlink to /dev/mapper/fs-db1 which doesn't exist.
lvs list's all of my logical volumes correctly, but it appears that the 
kernel isn't aware of them.
> * Can you capture the boot output for this domain?  Specify the -c flag to xm 
> to make it turn into the domain console.  With luck the domain will tell us 
> what's wrong...
> * Does the original problem ever come back after a reboot?
>
> Cheers,
> Mark
>
>  
>
> > The last 
> > succesful log entry mentions attempting to connect the event channel. After
> > this the domain is restarted.
> >
> > Any help with either of these issues would be greatly appreciated, I can
> > give plenty more details if needed.
> >
> > Scott.
> >
> >
> >
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> >    
>  


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