Thanks a lot for the recommendation, David! Are you aware of any drawbacks and / or known issues with using rbd-nbd?
On Fri, Oct 27, 2017 at 7:47 PM, David Turner <drakonst...@gmail.com> wrote: > rbd-nbd is gaining a lot of followers for use as mapping rbds. The kernel > driver for RBD's has taken a while to support features of current ceph > versions. The nice thing with rbd-nbd is that it has feature parity with > the version of ceph you are using and can enable all of the rbd features > you want to. > > When I do use the kernel driver, I usually find the kernel I want and then > disable RBD features until the RBD is compatible to be mapped by that > kernel. > > On Fri, Oct 27, 2017 at 12:34 PM Bogdan SOLGA <bogdan.so...@gmail.com> > wrote: > >> Hello, everyone! >> >> We have recently upgraded our Ceph pool to the latest Luminous release. >> On one of the servers that we used as Ceph clients we had several freeze >> issues, which we empirically linked to the concurrent usage of some I/O >> operations - writing in an LXD container (backed by Ceph) while there was >> an ongoing PG rebalancing. We searched for the issue's cause through the >> logs, but we haven't found anything useful. >> >> At that time the server was running Ubuntu 16 with a 4.5 kernel. We >> thought an upgrade to the latest HWE kernel (4.10) would help, but we had >> the same freezing issues after the kernel upgrade. Of course, we're aware >> that we have tried to fix / avoid the issue without understanding it's >> cause. >> >> After seeing the OS recommendations from the Ceph page >> <https://github.com/ceph/ceph/blob/master/doc/start/os-recommendations.rst>, >> we reinstalled the server (and got the 4.4 kernel), we ran into a feature >> set mismatch issue when mounting a RBD image. We concluded >> <http://cephnotes.ksperis.com/blog/2014/01/21/feature-set-mismatch-error-on-ceph-kernel-client> >> that the feature set requires a kernel > 4.5. >> >> Our question - how would you recommend us to proceed? Shall we re-upgrade >> to the HWE kernel (4.10) or to another kernel version? Would you recommend >> an alternative solution? >> >> Thank you very much, we're looking forward for your advice. >> >> Kind regards, >> Bogdan >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >
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