Re: [Xen-devel] dynamically allocating loopback devices?

[Mark Williamson <Mark.Williamson@xxxxxxxxxxxx>]

> I was confused by the fact that xm insists on it being present in DOM0.
>
> disk = [ 'file:/u/kmacy/mdroot-5.3,xbd0,w' ]
>
> kmacy@shemp sh -x ~/xentmp/xenargs.shemp
> + xm create -f /u/kmacy/xentmp/freebsd.shemp -c
> name=xen-vm2.lab.netapp.com vmid=10 kernel=/u/kmacy/kernel
> Using config file "/u/kmacy/xentmp/freebsd.shemp".
> Error: Error creating domain: vbd: Device not found: xbd0

That's because it used to stat the device node in dom0 so that it would know 
what major / minor to tell the domain to use.  Xend has since been patched to 
not require this, I'm not sure what trees it was checked into, though

Cheers,
Mark

> Thanks.
>
>           -Kip
>
> On Fri, 11 Mar 2005 22:09:04 -0000, Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx> 
wrote:
> > > That allows me to bypass the losetup, but what about device
> > > allocation? - the examples I see all look like
> > > disk = [ 'file:/u/kmacy/mdroot-5.3,loop7,w' ]
> >
> > file: does do the loop device allocation. The second parameter is the
> > device you want the vbd to appear in the guest as, i.e. usually sda1 or
> > hda1.
> >
> > Ian
>
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