fuel-dev team mailing list archive

[Dmitry Borodaenko <dborodaenko@xxxxxxxxxxxx>]

Dmitriy,

As Miroslav has mentioned, images in Glance should be in RAW for
copy-on-write cloning to be done when a new Cinder volume is created from
image. You will also come across this limitation (which, unlike other Ceph
related limitations, isn't yet addressed in our patch series for Nova):
https://bugs.launchpad.net/nova/+bug/1262914

Regards,
-DmitryB



On Wed, Jun 25, 2014 at 8:08 AM, Dmitriy Novakovskiy <
dnovakovskiy@xxxxxxxxxxxx> wrote:

> Hi Fuelers,
>
> One of my customers is testing Fuel 5.0 w/ Ceph. He's trying to boot a VM
> from a volume, using qcow2 image as a source for volume creation. What
> we're seeing (Nikita in CC was helping w/ troubleshooting) is:
> - image is copied from Glance (which uses Ceph as backend)
> - image is converted from qcow2 to raw
> - new RBD volume is created from raw image
>
> Looks kinda suboptimal - given both image and boot volume being hosted on
> Ceph I'd expect copy-on-write cloning to work.
>
> Q1) Are there some limitations here, like images stored on Ceph should be
> in RAW initially?
> Q2) Would the same (images should be in raw) apply to boot from image
> scenario, when VM's ephemeral disk is stored on Ceph?
>
> Thoughts much appreciated. If necessary I can arrange for someone to take
> a look at customer's pod
>
> ---
> Regards,
> Dmitriy
>
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-- 
Dmitry Borodaenko