Most production clusters are large enough that you don't have to bring down the entire cluster to do maintenance on particular machines. If your reconfiguring the entire network, that's a bit more involved. I'm not sure what your cluster looks like, so I can't advise. However, you mention changing IP addresses. Changing the IP addresses for the OSDs is okay, but you want to be careful when changing them for monitors. See http://ceph.com/docs/master/rados/operations/add-or-rm-mons/#changing-a-monitor-s-ip-address. Since monitors use the public network, this shouldn't be a problem in your case. You can change the config files if you've include OSD entries in your config file. You may also change the settings at runtime. See http://ceph.com/docs/master/rados/configuration/ceph-conf/#runtime-changes.
On Tue, Dec 31, 2013 at 9:35 AM, Scottix <scottix@xxxxxxxxx> wrote:
The way I have done it is so the osd don't get set out.Check the link belowhttp://ceph.com/docs/master/rados/troubleshooting/troubleshooting-osd/#stopping-w-out-rebalancing
--On Tue, Dec 31, 2013 at 12:43 AM, James Harper <james.harper@xxxxxxxxxxxxxxxx> wrote:
I need to shut down ceph for maintenance to make some hardware changes. Is it sufficient to just stop all services on all nodes, or is there a way to put the whole cluster into standby or something first?
And when things come back up, IP addresses on the cluster network will be different (public network will not change though). Is it sufficient to just change the config files and the osd's will register themselves correctly, or is there more involved?
Thanks
James
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