Active/active replication with disaster recovery support

You can combine active/active replication with active/passive replication to create a topology in which a third system provides disaster recovery support for the two systems that participate in an active/active link. In this topology, a set of HCP tenants and namespaces and default-namespace directories is replicated on an active/active link between two systems (A and B). Some of those items are also replicated on an active/passive link from A to a third system (C). The rest of the items are also replicated on an active/passive link from system B to system C.

The choice of which items to replicate on each active/passive link is independent of which system the items were initially created on. For example, an HCP tenant created locally on system A could be included on the active/passive link from B to C.

The following figure shows a simple active/active replication topology with disaster recovery support.

Simple active/active replication topology with disaster recovery support

In this figure:

  • Two of three HCP tenants created locally in system A are replicated between system A and system B. 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 HCP tenants created locally in system B are replicated between system A and system B. In the first tenant, two namespaces are selected for replication. In the second tenant, one of three namespaces is selected for replication.
  • From system A, one HCP tenant initially created on system A and one HCP tenant initially created on system B are replicated to system C.
  • From system B, one HCP tenant initially created on system A and one HCP tenant initially created on system B are replicated to system C.