On 05/02/2014 03:27 PM, Indra Pramana wrote: > Hi, > > May I know if it's possible to replace an OSD drive without removing / > re-adding back the OSD? I want to avoid the time and the excessive I/O > load which will happen during the recovery process at the time when: > > - the OSD is removed; and > - the OSD is being put back into the cluster. > > I read David Zafman's comment on this thread, that we can set "noout", > take OSD "down", replace the drive, and then bring the OSD back "up" and > unset "noout". > > http://www.spinics.net/lists/ceph-users/msg05959.html > > May I know if it's possible to do this? > > - ceph osd set noout > - sudo stop ceph-osd id=12 > - Replace the drive, and once done: > - sudo start ceph-osd id=12 > - ceph osd unset noout > > The cluster was built using ceph-deploy, can we just replace a drive > like that without zapping and preparing the disk using ceph-deploy? > There will be absolutely no quirks except continuous remapping with peering along entire recovery process. If your cluster may meet this well, there is absolutely no problem to go through this flow. Otherwise, in longer out+in flow, there are only two short intensive recalculations which can be done at the scheduled time, comparing with peering during remap, which can introduce unnecessary I/O spikes. > Looking forward to your reply, thank you. > > Cheers. > > > _______________________________________________ > ceph-users mailing list > ceph-users at lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
 |