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| jbernard | DHE: no, it writes it to a local cache and then writes it into the target image | 14:48 |
|---|---|---|
| jbernard | DHE: if the glance's backend is not ceph | 14:48 |
| jbernard | DHE: if it is, and it's in the same cluster, a ceph-level copy is made, much more efficient | 14:49 |
| jbernard | DHE: if you have a ceph cluster available to your OS services, you may want to consider adding a glace/ceph backend if volume-from-image is a common operation | 14:49 |
| jbernard | DHE: another option is to create volumes from images, incur the overhead, and then create volumes from those volumes already present in the cluster | 14:51 |
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| DHE | jbernard: I'm migrating from another cinder backend (or two) to Ceph, and my images are stored as files on the glance server mostly as qcow2. I'm not planning any changes to glance | 15:41 |
| DHE | but Ceph says that running the block storage ceph service and /dev/rbd* devices on the same system is at risk of deadlocks, which is a shame because running cinder-volume for ceph on that server seems like it would be ideal for performance reasons... | 15:42 |
| DHE | trying to figure out how I want to set this up... | 15:43 |
| jbernard | DHE: where are you seeing references to /dev/rbd ? | 15:47 |
| DHE | nothing cinder-specific, but that's what I'm asking. how does the image go from the local cache into the target image? | 15:48 |
| DHE | mapping /dev/rbd* to the volume having the image loaded onto it is one possibility | 15:48 |
| jbernard | DHE: cinder does not use krbd | 15:51 |
| jbernard | DHE: it uses librbd, so there is no local block device | 15:51 |
| jbernard | DHE: there should be no /dev/rbd files under normal configuration | 15:52 |
| jbernard | DHE: iow, i think you'll be fine | 15:56 |
| DHE | sounds like it. /dev/rbd* was specifically the problem and user libraries are fine. | 15:56 |
| jbernard | DHE: i need to check os-brick, it's possible that something has been added there that I'm not aware of (now that i think about it) | 16:00 |
| jbernard | DHE: is appears os-brick can do local attachments, its not clear to me if that will occur under normal cinder operation | 16:05 |
| jbernard | DHE: i need to look more but im out of time at the moment | 16:05 |
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