First, this depends on the MIN_SIZE parameter of a pool. Second even if the
MIN_SIZE is one this would only hold up to six node cluster. Imagine a nine
node cluster; losing two-thirds of a cluster can lead to a situation where all
replicas of an object are offline. I.e., you can only lose up to two failure
domains, in this case nodes, when you have a replication size of three.
Hans van den Bogert
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