On Thu, Jan 10, 2013 at 4:39 PM, Yasuhiro Ohara <yasu@xxxxxxxxxxxx> wrote: > > Hi, > > What will happen when constructing a cluster of 10 host, > but the hosts are gradually removed from the cluster > one by one (in each step waiting Ceph status to become healthy), > and reaches eventually to, say, 3 hosts ? > > In other words, is there any problem with having 10 osd configuration > in the ceph.conf, but actually only 3 is up (the 7 are down and out) ? If you're not using the /etc/init.d ceph script to start up everything with the -a option, this will work just fine. > > I assume that if the size of the replication is 3, we can turn off > 2 osds at each time, and Ceph can recover itself to the healthy state. > Is it the case ? Yeah, that should work fine. You might consider just marking OSDs "out" two at a time and not actually killing them until the cluster has become quiescent again, though — that way they can participate as a source for recovery. -Greg -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
