missing feature 400000000000000 ?

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Hello,

I am trying to install a test CephFS "Luminous" system on Ubuntu 16.04.

Everything looks fine, but the `mount.ceph` command fails (error 110, timeout);
kernel logs show a number of messages like these before the `mount`
prog gives up:

    libceph: ... feature set mismatch, my 107b84a842aca < server's
40107b84a842aca, missing 400000000000000

I read in [1] that this is feature
CEPH_FEATURE_NEW_OSDOPREPLY_ENCODING which is only supported in
kernels 4.5 and up -- whereas Ubuntu 16.04 runs Linux 4.4.

Is there some tunable or configuration file entry that I can set,
which will make Luminous FS mounting work on the std Ubuntu 16.04
Linux kernel?  I.e., is there a way I can avoid upgrading the kernel?

[1]: http://cephnotes.ksperis.com/blog/2014/01/21/feature-set-mismatch-error-on-ceph-kernel-client

Thanks,
Riccardo
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