On Tue, Sep 04, 2007 at 01:55:53PM -0400, Michael DeHaan wrote: > Johan Huysmans wrote: > >well... it is possible ;) > >because we are allready doing this for over a year. > > > > The word on the street (from Dan Berrange) is that this feature is not > guaranteed to work in future > versions of Xen. To be a little more verbose.... Virtual machines are assigned virtual *disks*. ie hdN, sdN (for full virt) or xvdN (for paravirt). Names like sda1 are partitions, and not disks. It makes no conceptual sense to have a partition without an enclosing disk. If you want to have a 1-1 mapping between the backing files & disks inside the guest, then simply don't partition the disk inside the guest - format /dev/sda directly. Xen paravirt only happens to allow you to map a file straight through as a partition, and while it may currently work, I can make absolutely no guarentees it will work in the future as the Xen paravirt kernel evolves - particularly as Xen increasingly merges into LKML trees. NB with the LKML merge the ability to hijack hdN and sdN in paravirt guests has been removed - paravirt can only use xvdN devices now. I've not checked if hijacking partitions as described below works, but I would not be surprised if it doesn't. Finally its also not portable to Xen fullyvirt, or KVM, or QEMU, etc. Basically unsupportable in the medium-to-long term. > >And the installation is quite simple: > >* you create your logical volumes in the dom0 and mount them > >* you install a minimal system with yum --installroot= > >* you create a xen config where you map the logical volumes to the > >partition inside the domU. > > > >The installation instructions can be found on my blog: > >http://www.raskas.be/blog/howtos/centos-base-image/ > > > >And this is how the disk section of my xen config looks like: > >disk = ['phy:vm_volumes/root-host1,sda1,w' > > ,'phy:vm_volumes/swap-host1,sda2,w' > > ,'phy:vm_volumes/tmp-host1,sda3,w' > > ,'phy:vm_volumes/varlog-host1,sda6,w' > > ,'phy:vm_volumes/home-host1,sda7,w' > > ] > > > >It would be really great if this would be possible to do with koan, > >for now we do this with our own create vhost script. > > Dan. -- |=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496 -=| |=- Perl modules: http://search.cpan.org/~danberr/ -=| |=- Projects: http://freshmeat.net/~danielpb/ -=| |=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 -=| _______________________________________________ et-mgmt-tools mailing list et-mgmt-tools@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/et-mgmt-tools
