In the docs: https://docs.ceph.com/docs/master/radosgw/multisite/ - in the 
section Requirements and Assumptions

There is this warning hint:
"Running a single Ceph storage cluster is NOT recommended unless you have low 
latency WAN connections."

What exactly does "single Ceph storage cluster" mean?
* Just having one site?
* Do I need to run multiple independent clusters across a number of n sites 
before I can do multi-site - so it would not be possible to start with one site 
and add further sites step by step?

And what exactly happens with higher latency WAN connections?
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