Re: [Xen-users] xen, booting up issue

[Robin Green <greenrd@xxxxxxxxxxxxx>]

On Thu, 7 Apr 2005, Shahzad Chohan wrote:

> Hi Robin,
>
> Thats a great idea, perhaps I'll try that way. I'll give a go and let you 
> know.
OK

> BTW: when using sda1 in the xen config, what would happen if I did have a 
> mount on a existing partition called /dev/sda1, and why is sda chosen to be 
> in the config? If you have time I'd love to know how these things work, and 
> is there a document you know of the explains the inner workings of xen.
When you have for example

file:/root/fedora.img,sda1,rw

the file:/root/fedora.img  refers to a real file (or device on dom0)
the sda1 however, refers to a VIRTUAL device /dev/sda1 that exists 
only inside the domU virtual machine.
It means make /root/fedora.img visible inside the domU virtual machine 
_as_ /dev/sda1. It has _nothing_ to do with the real partition /dev/sda1 
on the real machine! They are two completely separate devices, one virtual
and one real.

Of course, you can still map the virtual /dev/sda1 onto the 
real /dev/sda1 so that they _refer_ to effectively the same device, which 
is what my example in my previous email does, but with
/dev/hda5 instead of /dev/sda1:

> Robin Green wrote:
> >  > hmmmm bit lost what to do now. I could try to reinstall , but I'm 
> > thinking
> >  > how you have gone about an install.
> >
> > What I did is installed another copy of fedora on a spare partition in
> > the normal way, from a DVD, then booted that inside Xen *after* I'd
> > installed it. You just use
> >
> > phy:hda5,hda5,w
> >
> > for the disk in the configuration file (assuming that hda5 is where you
> > installed the new copy of fedora).
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