Unfortunately, you won't be able to use the new "rbd feature enable" command against a Hammer OSD since the command requires support within the RBD object class in the OSD. Additionally, since your images haven't had the object map enabled, they would need to have an object map built prior to that optimization actually taking effect. The master branch has a new "rbd object-map rebuild" helper to compute the object map on images that don't currently have a valid object map. It's quite possible that these new features will be backported into Hammer at some point in the future. Therefore, I would recommend waiting for the full toolset to become available. -- Jason Dillaman Red Hat dillaman@xxxxxxxxxx http://www.redhat.com ----- Original Message ----- From: "Christoph Adomeit" <Christoph.Adomeit@xxxxxxxxxxx> To: ceph-users@xxxxxxxxxxxxxx Sent: Tuesday, April 28, 2015 10:06:12 AM Subject: Use object-map Feature on existing rbd images ? Hi there, we are using ceph hammer and we have some fully provisioned images with only little data. rbd export of a 500 GB rbd Image takes long time although there are only 15 GB of used data, even if the rbd-image is trimmed. Do you think it is a good idea to enable the object-map feature on already existing rbd images ? I am thinking about using the rbd binary from ceph-master to change the features of some existing rbd images like this: rbd --image-feature exclusive-lock rbd --image-feature object-map Do you think this is a good idea, this will work and will be stable ? Thanks Christoph _______________________________________________ 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
 |