Thanks for reply. The new node is more powerful than the broken one, so this is a hardware-upgrade process too, and I think replace an node may be a common operation, so I want to explore a general-purpose method. 2014-09-04 21:15 GMT+08:00 Loic Dachary <loic at dachary.org>: > Hi, > > If the new machine can host the disks of the former machine, it should be > enough to > > a) install the new machine with ceph > b) shutdown the old and new machines > c) move the disks from the old machine to the new > d) reboot the new machine > > and the OSDs will show as if nothing happened. > > Cheers > > P.S. I explored this idea last year and wrote a few notes at > http://dachary.org/?p=2428 > > On 04/09/2014 14:56, Ding Dinghua wrote: > > Hi all, > > I'm new to ceph, and apologize if the question has been asked. > > > > I have setup a 8-nodes ceph cluster, and after two months > running, network controller of an node is broken, so I have to replace the > node with an new one. > > I don't want to trigger data migration, since all I want to do > is replacing a node, not shrink the cluster and then enlarge the cluster. > > I think the following steps may work: > > 1) set osd_crush_update_on_start to false, so when osd starts, > it won't modify crushmap and trigger data migration. > > 2) set noout flags to prevent osds been kicked out of cluster > and trigger data migration > > 3) mark all osds on the broken node down(actually, since > network controller is broken, these osds are already down) > > 4) prepare osd on the new node, and keep osd_num the same > with the osd on the broken node: > > ceph-osd -i [osd_num] --osd-data=path1 --mkfs > > 5) start osd on the new node, and peering and backfilling work > will be started automaticlly > > 6) wait until 5) complete, and repeat 4) and 5) until all osds > on the broken node been moved to the new node > > I have done some test on my test cluster, and it seemed works, > but I'm not quite sure it's right in theory, so any comments will be > appreciated. > > Thanks. > > > > -- > > Ding Dinghua > > > > > > _______________________________________________ > > ceph-users mailing list > > ceph-users at lists.ceph.com > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > -- > Lo?c Dachary, Artisan Logiciel Libre > > -- Ding Dinghua -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.ceph.com/pipermail/ceph-users-ceph.com/attachments/20140905/aba6545d/attachment.htm>
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