Dear cephers. I would like to request some clarification on migrating from legacy to optimal (jewel) tunables.
We have recently migrated from infernalis to Jewel. However, we are still using legacy tunables. All our ceph infrastructure (mons. odss and mdss) are running 10.2.2 in Centos 7.2.1511 and kernel 3.10.0-327.22.2.el7.x86_64. However, we are providing 10.2.2 clients (basically ceph-fuse) in SL6 and kernel 2.6.32-642.el6.x86_64. We do this because of the nature of the research performed by our scientists where there is (still) the requirement to provide cephfs under sl6. To be able to accomplish that, we have successfully compiled ceph in SL6 with gcc 4.8.4, python 2.7.6, boost 1.53.0-25 and fuse 2.9.7 which we enable via environment modules. The tunables documentation [1] states the following: WHICH CLIENT VERSIONS SUPPORT CRUSH_TUNABLES5 - v10.0.2 (jewel) or later - Linux kernel version v4.5 or later (for the file system and RBD kernel clients) Can you please confirm that the two previous requirements are ORed and not ANDed? I.e, can i migrate to Jewel tunables using ceph-fuse 10.2.2 in a SL6 box (running a 2.6 kernel) compiled as I explained above? TIA Goncalo [1] http://docs.ceph.com/docs/master/rados/operations/crush-map/#tunables
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