Single Data Center Failure Matrix (Sun Java System Directory Server Enterprise Edition 6.2 Deployment Planning Guide)

Sun Java System Directory Server Enterprise Edition 6.2 Deployment Planning Guide

Single Data Center Failure Matrix

In the scenario depicted in Figure 12–1, various components might become unavailable. These potential points of failure and the related recovery actions are described in this table.

Table 12–1 Single Data Center Failure Matrix


Failed Component	Action
Master 1	Read and write operations are rerouted to Masters 2 and 3 through Directory Proxy Server while Master 1 is repaired. The recovery replication agreement between Master 2 and Master 3 is enabled so that updates to Master 3 are replicated to Master 2.
Master 2	Read and write operations are rerouted to Masters 1 and 3 while Master 2 is repaired. The recovery replication agreement between Master 1 and Master 3 is enabled so that updates to Master 3 are replicated to Master 1.
Master 3	Because Master 3 is a backup server only, the directory service is not affected if this master fails. Master 3 can be taken offline and repaired without interruption to service.
Directory Proxy Server	Failure of Directory Proxy Server results in severe service interruption. A redundant instance of Directory Proxy Server is advisable in this topology. For an example of such a topology, see Using Multiple Directory Proxy Servers.