Problems understanding 'ceph features' output

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Hi

I tried the jewel --> luminous update on a small testbed composed by:

- 3 mon + mgr nodes
- 3 osd nodes (4 OSDs per each of this node)
- 3 clients (each client maps a single volume)


In short:

- I updated the 3 mons
- I deployed mgr on the 3 mon hosts
- I updated the 3 osd nodes
- I updated 2 client nodes (one is still running jewel)

After the update, everything seems ok, but I am not able to understand the "ceph features" output, which, for the client part, reports[*] 3 jewel clients and 5 luminous clients (?!?)

A "grep  0x1ffddff8eea4fffb" (luminous) on the mon log file reports the three mon-mgr nodes. While a "grep 0x40106b84a842a52" (jewel) doesn't return anything

Any hints ?

Thanks, Massimo



[*]
    "client": {
        "group": {
            "features": "0x40106b84a842a52",
            "release": "jewel",
            "num": 3
        },
        "group": {
            "features": "0x1ffddff8eea4fffb",
            "release": "luminous",
            "num": 5
        }

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