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A directory is often described as a database, but it is a specialized database that has characteristics that set it apart from general-purpose relational databases. One special characteristic of directories is that they are accessed (read or searched) much more often than they are updated (written). LDAP is a popular technology for accessing common directory information. LDAP has been embraced and implemented in most network-oriented middleware. Building LDAP-enabled networks and applications is a common practice in enterprise applications. WebSphere is LDAP-enabled. When the LDAP server fails, WebSphere cannot access directory data, such as security data, and hence fails to service client requests. Therefore, building a HA LDAP is a part of the highly available WebSphere system.
