Hi All I am new to openstack. I just deployed Openstack liberty using ceph as cinder and glance backend.
I have some images (raw format, about 10G) in glance (stored in ceph). I tried 2 different methods to spawn the instance. Because my image size are huge. If I want to spawn an instance by using creating a volume from an image and boot from that volume, ( http://docs.openstack.org/user-guide/cli_nova_launch_instance_from_volume.html) cinder-volume will download entire image from glance (also in the ceph). Instance will in error status after about 3 minutes (internal time-out mechanism?), saying block device mapping problem. However, my cinder is still creating the volume ( It will take 10 minutes for cinder to upload, download the image and create volume). So I came up with another method. I create a volume from glance first (also 10 minutes). If I want to spawn an new instance, I just clone that volume (it is instant). Then boot from that volume directly. My glance and cinder are using the same ceph cluster (different pools). I download some images from openstack ( http://docs.openstack.org/image-guide/obtain-images.html). Since their size are not that large, most are no more than 1G, it is fine to use the first method. Just wondering why cinder-volume has to download the image. Is there anyway to bypass this process? Or can ceph handle this internally? thanks for any advise!
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