Thanks josh，the problem is solved by updating ceph in the glance node. 发自我的 iPhone 在 2013-3-20，14:59，"Josh Durgin" <josh.durgin@xxxxxxxxxxx> 写道： > On 03/19/2013 11:03 PM, Chen, Xiaoxi wrote: >> I think Josh may be the right man for this question ☺ >> >> To be more precious, I would like to add more words about the status: >> >> 1. We have configured “show_image_direct_url= Ture” in Glance, and from the Cinder-volume’s log, we can make sure we have got a direct_url , for example. >> image_id 6565d775-553b-41b6-9d5e-ddb825677706 >> image_location rbd://6565d775-553b-41b6-9d5e-ddb825677706 >> 2. In the _is_cloneable function, it tries to “_parse_location” the direct_url (rbd://6565d775-553b-41b6-9d5e-ddb825677706) into 4 parts : fsid,pool,volume,snapshot . Since the direct_url passed from Glance doesn’t provide fsid ,pool and snapshot info, the parse is failed and _is_cloneable return false, which will finally drop the request to RBDDriver::copy_image_to_volume. > > This is working as expected - cloning was introduced in format 2 rbd > volumes, available in bobtail but not argonaut. When the image is > uploaded to glance, it is created as format 2 and a snapshot of it is > taken and protected from deletion if the installed version of librbd > (via the python-ceph package) supports it. > > The location reported will be just the image id for format 1 images. > For format 2 images, it has 4 parts, as you noted. You may need to > update python-ceph and librbd1 on the node running glance-api > and re-upload the image so it will be created as format 2, rather > than the current image which is format 1, and thus cannot be cloned. > >> 3. In Cinder/volume/driver.py,RBDDriver::copy_image_to_volume, we have seem this note: >> # TODO(jdurgin): replace with librbd this is a temporary hack, since rewriting this driver to use librbd would take too long >> And in this function, the cinder RBD driver download the whole image from Glance into a temp file in local Filesystem, then use rbd import to import the temp file into a RBD volume. > > That note is about needing to remove the volume before importing the > data, instead of just writing to it directly with librbd. > >> This is absolutely not what we want (zero copy and CoW), so we digging into the _is_cloneable function >> >> Seems the straightforward way to solve 2 ) write a patch for glance that adding more infos in the direct_url, but I am not sure if it’s possible for ceph to clone a RBD from pool A to pool B? > > Cloning from one pool to another is certainly supported. If you're > interested in more details about cloning, check out the command line > usage [1] and internal design [2]. > > Josh > > [1] https://github.com/ceph/ceph/blob/master/doc/rbd/rbd-snapshot.rst#layering > [2] https://github.com/ceph/ceph/blob/master/doc/dev/rbd-layering.rst > >> From: ceph-users-bounces@xxxxxxxxxxxxxx [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Li, Chen >> Sent: 2013年3月20日 12:57 >> To: 'ceph-users@xxxxxxxxxxxxxx' >> Subject: create volume from an image >> >> I'm using Ceph RBD for both Cinder and Glance. Cinder and Glance are installed in two machines. >> I have get information from many place that when cinder and glance both using Ceph RBD, then no real data transmit will happen because of copy on write. >> But the truth is when i run the command: >> cinder create --image-id 6565d775-553b-41b6-9d5e-ddb825677706 --display-name test 3 >> I can still get network data traffic between cinder and glance. >> And I check the cinder code, the image_location is None (cinder/volume/manager.py), which makes cinder will failed running cloned = self.driver.clone_image(volume_ref, image_location). >> Is this a OpenStack (cinder or glance )bug ? >> Or I have miss and configuration? >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@xxxxxxxxxxxxxx >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |