Active/passive one-to-many replication

In an active/passive one-to-many replication topology, one HCP system replicates to two or more other HCP systems using separate active/passive replication links. The replicating system is the primary system for each link. The other systems are replicas.

Typically, in an active/passive one-to-many replication topology, the replication links include different HCP tenants and namespaces and default-namespace directories.

If three systems need to have the same tenants, namespaces, and directories as each other, consider using a chained topology for them rather than a one-to-many topology. The one-to-many topology puts greater load on the single primary system than does a chained topology, which splits the load between the first and second systems in the chain.

In some cases, however, replicating the same tenants and namespaces to two different replicas in a one-to-many topology may be appropriate.

NoteYou can also create a one-to-many replication topology that consists of a combination of active/passive and active/active links or even only active/active links.

What this looks like

The figure below shows an active/passive one-to-many replication topology in which one primary system (A) replicates to two replicas (B and C) over two separate replication links.

Active/passive one-to-many replication topology in which one primary system (A) replicates to two replicas (B and C) over two separate replication links

In this figure:

  • Two of three HCP tenants in system A are being replicated to 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.
  • The third HCP tenant in system A is being replicated to system C. This tenant has two namespaces, both of which are selected for replication.