On Wed, Sep 05, 2007 at 11:18:49AM +0200, Kris Buytaert wrote: > On Wed, 2007-09-05 at 04:28 +0100, Daniel P. Berrange wrote: > > 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. > > > I think it is extremely important to continue to be able to use > filesystems on LVM volumes in dom0 as filesystems in domU's. Using > them as full disks with a partition on them would be fine. Yes, that is entirely possible. If you have /dev/VolGroup00/MyGuestFS in the dom0, you can map that into the guest as /dev/xvda and simply mount /dev/xvda itself - there is no need to pretend it is /dev/xvda1 inside the guest. 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
