On 14/07/17 11:03, Ilya Dryomov wrote: > 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 Alternatively, keep in mind you can install ceph-fuse and mount the FS using that userland client instead, if you'd prefer the tunables in your cluster to be up to date. Rich
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