fuel-dev team mailing list archive

[Meg McRoberts <mmcroberts@xxxxxxxxxxxx>]

And yes, that section about choosing Ceph, etc belongs in the Planning
Guide --
I'm working on it:

https://review.openstack.org/#/c/100051/

I've got more work to do on that piece but feel free to add comments with
additional
information you'd like.

meg


On Wed, Jun 25, 2014 at 8:45 AM, Miroslav Anashkin <manashkin@xxxxxxxxxxxx>
wrote:

> Hi Dmitry,
>
> A1 - A2) Yes. It is greatly recommended to use RAW images for CEPH. CEPH
> has own copy-on-write mechanism.
> For qcow2 ones Ceph has to expand and convert the image to full size,
> since it does not support images with on-demand space reservation.
> BTW, it is in our docs:
>
> http://docs.mirantis.com/openstack/fuel/fuel-5.0/reference-architecture.html?highlight=raw#object-storage-for-images
>
> Kind regards,
> Miroslav
>
>
> On Wed, Jun 25, 2014 at 7:08 PM, 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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>>
>
>
> --
>
> *Kind Regards*
>
> *Miroslav Anashkin**L2 support engineer**,*
> *Mirantis Inc.*
> *+7(495)640-4944 <%2B7%28495%29640-4944> (office receptionist)*
> *+1(650)587-5200 <%2B1%28650%29587-5200> (office receptionist, call from
> US)*
> *35b, Bld. 3, Vorontsovskaya St.*
> *Moscow**, Russia, 109147.*
>
> www.mirantis.com
>
> manashkin@xxxxxxxxxxxx
>
>
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