Re: [Xen-devel] failed startup caused by unpriveledged domain device nodes not present in priviledged domain

[Luciano Miguel Ferreira Rocha <strange@xxxxxxxxxxxxx>]

On Thu, Dec 23, 2004 at 01:37:08AM +1300, Scott Mohekey wrote:
> I have a gentoo install running as Domain0 which uses a compaq smart 
> array for it's disk storage (/dev/ida/c0d0) because of this, there are 
> no device nodes present for /dev/sdX or /dev/hdX (aside from /dev/hdc 
> for the cdrom). I'm trying to make my unpriviledged domains use lvm 
> volumes with the following configuration:
> 
> disk = [ 'phy:fs/ns1,sda1,w', 'phy:fs/ns1_swap,sda2,w' ]
> 
> When I try and start the domain, I get the following output:
> 
> Using config file "/etc/xen/ns1".
> Error: Error creating domain: vbd: Device not found: sda1
> 
> If I replace sda1 with hdc it works (except that it now complains about 
> sda2).

IIRC, I had the same problem with a FC3 because of udev and no /dev/sd*
devices in the domain0.

You can either create the devices manually (cd /dev && MAKEDEV sda), or
use hda1, hda2 instead of sda1, sda2.

> This strikes me as odd behaviour, shouldn't the device nodes in the 
> priviledged domains be largely irrelevant for the unpriviledged domains 
> (in the case of vbds at any rate)?

Yes, but xen probably needs those in order to find out the major and
minor information.

It would be nice if xen was changed to try some defaults for sd and hd,
though.

Regards,
Luciano Rocha


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