Hi,
I may be wrong, but AFAIK the cluster network is only used to bind the
corresponding functionality to the correct network interface. There's no
check for a common CIDR range or something similar in CEPH.
As long as the traffic is routeable from the current public network and
the new cluster network, you should be able to transform the network
setup host by host without any downtime. We used the same strategy to
get rid of our IPoIB cluster network by defining one host as gateway to
the cluster network and adding static routes on the other hosts during
the transition. After all hosts were processed, we simply deleted the
routes.
In case of the original poster it should simply be a matter of defining
the cluster network in ceph.conf and restarting the OSDs, since the
cluster network interfaces are already present on all hosts.
Regards,
Burkhard
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