Re: [Xen-users] dual personalities

[Kent Watsen <kent@xxxxxxxxxx>]

> > I have a working DomU when located on a physical partition (i.e. hdb, 
> > a 2nd HD that I'm using to stage guest domains), but it all goes bad 
> > when I copy the root/swap partitions into LVM-based partitions.  
> > Specifically, I have a working guest domain on hdb2 (swap is hdb1).  
> > I created the logical volumes using the usual mix of pvcreate, 
> > vgcreate, and lvcreate:
> >    pvcreate /dev/hda5vgcreate xen-vg /dev/hda5
> >    lvcreate -L5G -n suse-root xen-vg
> >    mkfs.reiserfs /dev/xen-vg/suse-root
> >    cp -ax /<the real parition> /<the new partition> (yes, this seemed
> >    to work as expected)
>
> Sorry, I am confused by this. Are you copying
> a filesystem image or a tree of files on a mounted
> filesystem?
>
> The absence on any mount commands suggests the former.
> The presence of the mkfs.reiserfs command suggests the latter.
>
> Incidently I tend to avoid using cp because I can never
> remember how it works. I tend to dd to copy disk images
> and a pair of tar commnds in a pipeline to copy file trees
> around.

Yes, there were some mount commands also - I was trying to save the list 
some of the details, but they were something like:
   mkdir /mnt/hdb; mount /dev/hdb1 /mnt/hdb1
   mkdir /mnt/suse-root; mount /dev/xen-vg/suse-root /mnt/suse-root

then the `cp` was like:

   cp -ax /mnt/hdb1 /mnt/suse-root


and, of course, after the copy finished, I cleaned up as follows:

   umount /mnt/hdb1; rmdir /mnt/hdb1
   umount /mnt/suse-root; rmdir /mnt/suse-root




> >    lvcreate -L256M -n suse-swap xen-vg
> >    mkswap /dev/xen-vg/suse-swap
> >
> > The only other modification I made was to the start-up script as 
> > follows:
> >    < disk = [ 'phy:xen-vg/suse-root,hdb2,w',
> >    'phy:xen-vg/suse-swap,hdb1,w' ]
> >    ---
> >     > disk = [ 'phy:hdb2,hdb2,w', 'phy:hdb1,hdb1,w' ]
>
> I am using xen-2.0.7
>
> For my domU configuration file I have:
>
>   disk = [ 'phy:/dev/system/domU1_root,hda1,w',
>            'phy:/dev/system/domU1_swap,hda2,w']
>
> i.e. are you missing a /dev/ prefix somewhere?
>
> I'm not sure this is causing you a problem though,
> it just seems better to use an explicit path.
>
> If you fsck and mount your LVM filesystem images,
> do they check OK, mount OK, contain all the
> files you expect to be there?
From the user-guide, this appears to be the right syntax when using LVM 
- besides, the guest boot was almost successful...


Kent


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