Now that you mention it, I remember those threads on the ML. What happens if you use --yes-i-really-mean-it to do those things and then later you try to map an RBD with an older kernel for CentOS 7.3 or 7.4? Will that mapping fail because of the min-client-version of luminous set on the cluster while allowing CentOS 7.5 clients map RBDs?
On Mon, Sep 10, 2018 at 1:33 PM Ilya Dryomov <idryo...@gmail.com> wrote: > On Mon, Sep 10, 2018 at 7:19 PM David Turner <drakonst...@gmail.com> > wrote: > > > > I haven't found any mention of this on the ML and Google's results are > all about compiling your own kernel to use NBD on CentOS. Is everyone > that's using rbd-nbd on CentOS honestly compiling their own kernels for the > clients? This feels like something that shouldn't be necessary anymore. > > > > I would like to use the balancer module with upmap, but can't do that > with kRBD because even the latest kernels still register as Jewel. What > have y'all done to use rbd-nbd on CentOS? I'm hoping I'm missing something > and not that I'll need to compile a kernel to use on all of the hosts that > I want to map RBDs to. > > FWIW upmap is fully supported since 4.13 and RHEL 7.5: > > https://www.spinics.net/lists/ceph-users/msg45071.html > > http://lists.ceph.com/pipermail/ceph-users-ceph.com/2018-August/029105.html > > Thanks, > > Ilya >
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