Re: [Xen-users] 2 instances of a DomU on the same LV

[Guy Roussin <guy.roussin@xxxxxxxxxxxxxxxx>]

Hi,
> > if i try to 'xm create xen-int-vm01.cfg' on LM09q i get this error :
> > xm create xen-int-vm01.cfg
> > Using config file "./xen-int-vm01.cfg".
> > Error: VM name 'xen-int-vm01' already exists
> > ...
> > But, with virt-manager i can start xen-int-vm01 on LM09q
> > so thereis 2 instances of the DomU sharing the same LV !!!
> >     
> You misunderstood the commands.
>
> First the basics: xen does a basic sanity check to prevent more than a
> domU uses the same block device/file when it's set as writable, unless
> user specifically overides it. The check is only on the same dom0.
> Nothing is done to prevent the same device used on another dom0. You
> need some other kind of external mechanism to prevent that.
>
> Your original "xm create" command failed because the domU is already
> defined, but not started. You can start it with "xm start", which
> would produce the same result as starting it from virt-manager
Thank you Fajar, now i understand the logic.
Is there some "external mechanism" i can use ?
Otherwise I could develop my own simple mechanisms (shell scripts),
and stop using virt-manager.

Thank you,

Guy

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