History
During the product's inception, IBM named its product the IBM SecureWay Directory. This name wasn't changed until the Release 5.1 of the product and was then known as IBM Directory Server. With the next version of the product, Release 5.2, the name was again changed to include the Tivoli in it, and is now known as IBM Tivoli Directory Server. The latest release offered as of Nov 2011 is IBM Tivoli Directory Server 6.3.
IBM's directory server uses their DB2/UDB database as the underlying data store. In older versions, the impact of this was that it had comparatively poor performance, and required tuning of both the LDAP server and the UDB server to get any kind of respectable performance. As of the latest version (6.1), and possibly the one before (5.1), it is believed that the server's performance has been rectified.
Read more about this topic: IBM Tivoli Directory Server
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