We are using a production cluster which started in Firefly, then moved to Giant, Hammer and finally Jewel. So our images have different features correspondind to the value of "rbd_default_features" of the version when they were created. We have actually three pack of features activated : image with : - layering ~ 1 - layering, striping ~3 - layering, exclusive-lock, object-map, fast-diff, deep-flatten ~ 61
1) Is it a good idea to try to give all images the same features ? 2) Is it possible to disable the striping feature on an already created image (we never specify any stripe-unit nor stripe-count) ? 3) What is the behaviour of an already created image on which we activate the object-map feature ? Will a process try to rebuild a index of used blocks - if no, if we delete later the image, will ceph try to remove all the blocks or only the blocks refered by object-map index ? 4) We are on Jewel but with tunables set to hammer (Centos 7.2). What are the best default features to set in that case ? (we use Ceph under an Openstack for glance, nova and cinder
_______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
