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As long as I remember, when object-map is bad you will see this flag on rbd info.We are having issues with ensuring that object-map and fast-diff is working correctly. Most of the time when there is an invalid fast-diff map, the flag is set to correctly indicate this. We have a script that checks for this and rebuilds object maps as required. If we don't fix these, snapshot removal and rbd usage commands are too slow. About 10% of the time when we issue an `rbd du` command we get the following situation. warning: fast-diff map is invalid for 2d6b4502-f720-4c00-b4a4-8879e415f283 at 18-D-2018-07-11:1109. operation may be slow. When we check the `rbd info` it doesn't have any flags set. [INFO] {"name":"2d6b4502-f720-4c00-b4a4-8879e415f283","size":536870912000,"objects":128000,"order":22,"object_size":4194304,"block_name_prefix":"rbd_data.17928643c9869","format":2,"features":["layering","exclusive-lock","object-map","fast-diff","deep-flatten"],"flags":[],"create_timestamp":"Sat Apr 28 19:45:59 2018"} [Feat] ["layering","exclusive-lock","object-map","fast-diff","deep-flatten"] [Flag] [] Is there another way to detect invalid object maps? Ceph 12.2.7 - All Bluestore for e in `rbd ls replicated_rbd`; do echo "replicated_rbd/${e}"; rbd info replicated_rbd/${e} | grep "flag"; done
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