[one-users] OpenNebula ceph snapshots problem.

[Vladislav Gorbunov]

>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
>> >>
>> >>
>> >
>> >
>> > _______________________________________________
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>> > 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
>
>
>
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