[one-users] OpenNebula ceph snapshots problem.

[Leszek Master]

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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