[one-users] OpenNebula ceph snapshots problem.

[Leszek Master]

Can you write me what i need to do to migrate to qcow2 format? I've got
running vm's that cannot be "deleted". I tried migrating them form rbd v1
to v2 but this doesn't solved my problem.


2014-04-30 12:41 GMT+02:00 Javier Fontan <jfontan at opennebula.org>:

> I'm not sure I follow you with that. Just changing the TM from ceph to
> qcow2 is something that probably doesn't work. One of the things that
> can be failing is that getting the free space from ceph and qcow2 is
> totally different and it may be that the datastore is reporting 0
> bytes free. In this case the scheduler will never start a VM that uses
> that datastore.
>
> On Wed, Apr 23, 2014 at 9:18 AM, Leszek Master <keksior at gmail.com> wrote:
> > I tried to change rbd image version from 1 to 2 but it doesn't work. But
> > when i changed in my ceph datastore TM_MAD to qcow2 the new VM
> instantized
> > from image that was in the datastore stuck on "PENDING". Is there any
> way to
> > get this working with "existing" images?
> >
> >
> > 2014-04-21 14:53 GMT+02:00 Stuart Longland <stuartl at vrt.com.au>:
> >
> >> On 17/04/14 01:18, Leszek Master wrote:
> >> > 1) I'm using OpenNebula 4.4 with ceph datastore. When i try to make
> >> > snapshot i've got error:
> >> > 3) Is there any way to use copy-on-write in opennebula 4.4 ?
> >>
> >> I did some experimental work on this with our OpenNebula 4.4 instance.
> >> It relies on modern kernel's ability to map version-2 RBD images using
> >> the kernel rbd driver, so it needs kernel >3.10 (? Not sure of exact
> >> version; we're using 3.13).
> >>
> >> This newer format allows copy-on-write cloning.  "Hot" snapshots work,
> >> however I haven't managed to trigger a deferred snapshot, so that's
> >> untested.  The driver also makes use of hypervisor-side cache using
> >> FlashCache, allocating slices of a nominated LVM volume to boost
> >> performance.
> >>
> >> I've thrown my work into a git repository for now, consider this very
> >> much pre-alpha.  If you're brave, feel free to give it a go:
> >>
> >> git clone git://git.longlandclan.yi.org/opennebula-ceph-flashcache.git
> >>
> >> Regards,
> >> --
> >> Stuart Longland
> >> Systems Engineer
> >>      _ ___
> >> \  /|_) |                           T: +61 7 3535 9619
> >>  \/ | \ |     38b Douglas Street    F: +61 7 3535 9699
> >>    SYSTEMS    Milton QLD 4064       http://www.vrt.com.au
> >>
> >>
> >
> >
> > _______________________________________________
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> >
>
>
>
> --
> Javier Fontán Muiños
> Developer
> OpenNebula - The Open Source Toolkit for Data Center Virtualization
> www.OpenNebula.org | @OpenNebula | github.com/jfontan
>
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