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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