Hi All, Slide 19 of Ceph at CERN presentation http://www.slideshare.net/Inktank_Ceph/scaling-ceph-at-cern says that when removing an OSD from Ceph it is faster to just "ceph osd crush rm <osd id>" rather than marking the osd as "out", waiting for data migration, and then "rm" the OSD. The reason they give is that "out then rm" leads to two modifications to CRUSH and two data migrations, which takes more time. I have observed this to be true!
However, is it safer to do the "out then rm"? Doesn't just doing an "rm" make replicas unavailable? (BTW, they used replica = 4, so maybe they were less concerned!) Thanks! Chad. _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
