On Fri, Jul 14, 2017 at 11:29 AM, Riccardo Murri
<riccardo.mu...@gmail.com> wrote:
> 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
Yes, you should be able to set your CRUSH tunables profile to hammer
with "ceph osd crush tunables hammer".
Thanks,
Ilya
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