Stop clients

Then:

ceph osd set noout
ceph osd set nobackfill
ceph osd set norecover

Those flags should be totally sufficient to safely powerdown your cluster but you could also set the following flags on top if you would like to pause your cluster completely::

ceph osd set norebalance
ceph osd set nodown
ceph osd set pause

Pausing the cluster means that you can't see when OSDs come back up again and no map update will happen

Then:

• shutdown rados-gw
• shutdown osd
• shutdown mons

After maintenance just do everything mentioned above in reverse order.