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Description of problem: When the user has created few rbd images and wants to use it for iscsi target, only a specific set of features should be enabled on the rbd image. Version-Release number of selected component (if applicable): ceph-iscsi-ansible-1.5-1.el7test.noarch ceph-ansible-1.0.5-39.el7scon.noarch How reproducible: Always Additional info: Rbd images from ceph 2.0 onwards have a lot of features enabled by default. rbd info temp1/ansible1 rbd image 'ansible1': size 102400 MB in 25600 objects order 22 (4096 kB objects) block_name_prefix: rbd_data.1ee19238e1f29 format: 2 features: layering, exclusive-lock, object-map, fast-diff, deep-flatten flags: We need to add a note or warning somewhere that rbd images need to have the following features disabled : object-map, fast-diff, deep-flatten Also this is the error seen when trying to map an rbd image which has all these features enabled: rbd: sysfs write failed rbd: map failed: (22) Invalid argument rbd: sysfs write failed rbd: map failed: (6) No such device or address
Not a must have for 2.1 release, but we absolutely need this warning when iscsi comes out of tech preview. Thanks, Tejas
Since Iscsi is not targeted in ceph 2.2, the doc changes made in ceph 2.1 docs are sufficient. The doc looks good to me. Thanks, Tejas