On Tue, May 20, 2014 at 10:27 AM, Pierre Grandin <
pierre.grandin at tubemogul.com> wrote:
> Ok i found the error with my code. So if i try to do the snapshot with the
> image and volume from my previous mail, it works :
>
> import rbd
> import rados
>
> cluster = rados.Rados(conffile='/etc/ceph/ceph.conf')
> cluster.connect()
> src_ioctx = cluster.open_ioctx('images')
> dest_ioctx = cluster.open_ioctx('volumes')
>
> rbd.RBD().clone(src_ioctx,
> '55542add-6dca-4a01-8f17-bc4aed962f5e',
> 'snap',
> dest_ioctx,
> 'c29a96da-5165-4190-9727-0b728648f6a6_disk',
> features=rbd.RBD_FEATURE_LAYERING)
>
>
> # rbd -p volumes info c29a96da-5165-4190-9727-0b728648f6a6_disk
> rbd image 'c29a96da-5165-4190-9727-0b728648f6a6_disk':
> size 2048 MB in 256 objects
> order 23 (8192 kB objects)
> block_name_prefix: rbd_data.1d4886b8b4567
> format: 2
> features: layering
> parent: images/55542add-6dca-4a01-8f17-bc4aed962f5e at snap
> overlap: 2048 MB
>
> Now need to find why nova believe it did not work..
>
> --
> Pierre
>
>>
Found the rootcause.
Most of our flavors currently have a rootdisk size of 0.
It works when using local storage ( you get a root image with the disk size
of the image itself) but does not work when using ceph.
Code excerpt :
# NOTE(cfb): Having a flavor that sets the root size to 0 and having
# nova effectively ignore that size and use the size of the
# image is considered a feature at this time, not a bug.
--
Pierre
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