Hi, Take a look at the docs here ( http://docs.ceph.com/docs/jewel/rados/operations/crush-map/#tunables) for details on what tunables work with which kernel version. and how you can change them e.g:
'ceph osd crush tunables bobtail' You could use a main line kernel from here (http://elrepo.org/tiki/kernel-ml) as 4.6 is available for CentOS7 Thanks On Tue, Jul 12, 2016 at 5:45 PM, Mike Jacobacci <mi...@flowjo.com> wrote: > Hi Sean, > > Thanks for the quick response, this is what I see in dimes: > > set mismatch, my 102b84a842a42 < server's 40102b84a842a42, missing > 400000000000000 > > How can I set the tunable low enough? And what does that mean for > performance? > > Cheers, > Mike > > On Jul 12, 2016, at 9:43 AM, Sean Redmond <sean.redmo...@gmail.com> wrote: > > Hi, > > It should work for you with kernel 3.10 as long as turntables are set low > enough - Do you see anything in 'dmesg'? > > Thanks > > On Tue, Jul 12, 2016 at 5:37 PM, Mike Jacobacci <mi...@flowjo.com> wrote: > >> Hi All, >> >> Is mounting rbd only really supported in Ubuntu? All of our servers are >> CentOS 7 or RedHat 7 and since they are at Kernel 3.10, I can’t get rbd >> working. Even if I use legacy tunables or set tunables to 1/2/3… Nothing >> will mount the block device. >> >> The only answer I can find to get this working under RHEL or CentOS is to >> upgrade the kernel… Doesn’t that mean RBD isn’t support for a production >> environment unless it’s Ubuntu or whatever OS supports a Kernel over 3.18? >> >> Thanks for everyone’s help so far! >> >> Cheers, >> Mike >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > > >
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