[one-users] OpenNebula ceph snapshots problem.

[Leszek Master]

I can't migrate to NFS because the disk io performance won't handle my VM's.
There isn't any sunstone modification to use rbd v2 images snapshots ? I
can create them using rbd snap create, but don't have the possibility to
use it via sunstone.



2014-05-14 16:31 GMT+02:00 Vladislav Gorbunov <vadikgo at gmail.com>:

> >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.
> You need NFS datastore. Only NFS or SSH datastore support qcow2 file
> format. But Opennebula can't move image between datastores.
> 1. Shutdown vm
> 2. Convert from ceph to qcow2 format:
> export image="vm-disk-1"; qemu-img convert -O qcow2 rbd:`oneimage show
> $image|awk '/^SOURCE/ {print $3}'`
> /var/lib/one/datastore/123/$image.qcow2
> 3. Rename ceph image:
> oneimage rename $image $image.bak
> 4. Import qcow2 image to NFS datastore with id 123 for example:
> oneimage create -d nfsdatastorename --name $image --type os
> --persistent --source /var/lib/one/datastores/123/$image.qcow2
> --driver qcow2 --size  `rbd info rados/$image|awk '/size/ {print
> $5*4}'`
> 5. Start vm
>
> 2014-05-14 22:08 GMT+12:00 Leszek Master <keksior at gmail.com>:
> > 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
> >> >>
> >> >>
> >> >
> >> >
> >> > _______________________________________________
> >> > Users mailing list
> >> > Users at lists.opennebula.org
> >> > http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
> >> >
> >>
> >>
> >>
> >> --
> >> Javier Fontán Muiños
> >> Developer
> >> OpenNebula - The Open Source Toolkit for Data Center Virtualization
> >> www.OpenNebula.org | @OpenNebula | github.com/jfontan
> >
> >
> >
> > _______________________________________________
> > Users mailing list
> > Users at lists.opennebula.org
> > http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
> >
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.opennebula.org/pipermail/users-opennebula.org/attachments/20140515/3c9349ea/attachment.htm>