Redundancy at the Software Level

Failure in Directory Server or Directory Proxy Server can include the following:

• Excessive response time

• Write overload

  • Maximized file descriptors

  • Maximized file system

  • Poor storage configuration

  • Too many indexes

• Read overload

• Cache issues

• CPU constraints

• Replication issues

  • Synchronicity

  • Replication propagation delay

  • Replication flow

  • Replication overload

• Large wildcard searches

These SPOFs can be mitigated by having redundant instances of Directory Server and Directory Proxy Server. Redundancy at the software level involves the use of replication. Replication ensures that the redundant servers remain synchronized, and that requests can be rerouted with no downtime. For more information, see Using Replication and Redundancy for High Availability.