Administration Guide › Set Up Replication › Multiwrite Replication › How Multiwrite Replication Works

How Multiwrite Replication Works

Multiwrite replication sends updates in real time to all other DSAs in the same group or region. When a client makes an update request, that update is applied immediately to the local DSA, and then to all other DSAs. The client receives a confirmation response only after all DSAs have responded.

Example: A Simple Multiwrite System

The following diagram shows these steps:

1. The client sends an update request to the directory.

   DSA 1 receives the request and immediately applies the update to itself.

2. DSA 1 sends the update request to its peers, DSA 2 and DSA 3.
3. DSA 2 and DSA 3 each apply the update to itself, and then send an update response to DSA 1.
4. After receiving an update response from both peers, DSA 1 sends an update confirmation to the client.

   Any client can now query any DSA and it gets the same response, because the update has been made to all DSAs.