On Fri, Jul 14, 2017 at 11:29 AM, Riccardo Murri <riccardo.murri@xxxxxxxxx> 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 _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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