Problems understanding 'ceph-features' output

[Massimo Sgaravatto <massimo.sgaravatto@xxxxxxxxx>]

I have a ceph cluster where mon, osd and mgr are running ceph luminous

If I try running ceph features [*], I see that clients are grouped in 2 sets:

- the first one appears using luminous with features 0x3ffddff8eea4fffb

- the second one appears using luminous too, but with features 0x3ffddff8eeacfffb

If I try to check which are these clients (I use 'ceph daemon mon.xyz sessions' on the 3 mons) I see that the second group includes also some Openstack nodes which are actually using Nautilus.

Is this normal/expected that they appear using luminous as release ?

Can the 'ceph features' output be used to understand if I am ready to switch to upmap for the balancer ?

I.e. are 0x3ffddff8eea4fffb and 0x3ffddff8eeacfffb good enough for upmap ? 

Thanks, Massimo

# ceph features
{
    "mon": {
        "group": {
            "features": "0x3ffddff8eeacfffb",
            "release": "luminous",
            "num": 3
        }
    },
    "osd": {
        "group": {
            "features": "0x3ffddff8eeacfffb",
            "release": "luminous",
            "num": 70
        }
    },
    "client": {
        "group": {
            "features": "0x3ffddff8eea4fffb",
            "release": "luminous",
            "num": 16
        },
        "group": {
            "features": "0x3ffddff8eeacfffb",
            "release": "luminous",
            "num": 74
        }
    }
}

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