Active/active replication ring topology
An active/active replication ring topology that includes four, five, or six HCP systems can be used as the basis for an erasure coding topology. When you add a tenant to the erasure coding topology, if the tenant is not already being replicated in the ring topology, HCP automatically adds that tenant to all the links in the ring topology.
What this looks like
The following figure below shows an active/active replication ring topology that includes four systems (A, B, C, and D).

In this figure:
•Two of three HCP tenants created locally in system A are being replicated around the ring. In the first tenant being replicated, two of three namespaces are selected for replication. In the second tenant being replicated, one of two namespaces is selected for replication.
•Two tenants created locally in system D are being replicated around the ring. In the first tenant, two namespaces are selected for replication. In the second tenant, one of three namespaces is selected for replication.