An erasure coding topology can include from three through six HCP systems. An erasure coding topology with four, five, or six systems can be based on either an active/active replication ring topology or a fully connected active/active replication topology. A three-system erasure coding topology is always based on a fully connected active/active replication topology.
Before you can create an erasure coding topology, the underlying replication topology must already exist.
The figures below show all the replication topologies on which an erasure coding topology can be based.
For more information about these replication topologies, see Active/active replication ring and Fully connected active/active replication.
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