Hi, I just did a new Ceph installation and would like to enable the "read balancer". However, the documentation requires that the minimum client version be reef. I checked this information through "ceph features" and came across the situation of having 2 luminous clients. # ceph features { "mon": [ { "features": "0x3f03cffffffdffff", "release": "squid", "num": 2 } ], "mds": [ { "features": "0x3f03cffffffdffff", "release": "squid", "num": 2 } ], "osd": [ { "features": "0x3f03cffffffdffff", "release": "squid", "num": 38 } ], "client": [ { "features": "0x2f018fb87aa4aafe", "release": "luminous", "num": 2 }, { "features": "0x3f03cffffffdffff", "release": "squid", "num": 5 } ], "mgr": [ { "features": "0x3f03cffffffdffff", "release": "squid", "num": 2 } ] } I tryed to configure the minimum version to reef and received the following alert: # ceph osd set-require-min-compat-client reef Error EPERM: cannot set require_min_compat_client to reef: 2 connected client(s) look like luminous (missing 0x80000000); add --yes-i-really-mean-it to do it anyway Is it ok do confirm anyway? Which processes are still as luminous? Rafael.