Abstract: The invention proposes a directory server system having a master server and a non-master server, each server being capable of storing directory server data comprising updates. The master server is capable of sending selected updates to the non-master server, and the non-master server (512) has: a dependency checker (5224) operable for determining whether each update received from the master server (510) depends on other updates among the selected updates, and if not for sending the update to an update application function (5220), the update application function being operable for applying the updates received from the dependency checker in the non-master server directory server data.

Abstract: A directory server system may include master servers and a non-master server, each server storing directory server data that includes updates, each update having a creation time. The master servers exchange replicate updates through update communications. Each master server may include an update state builder for maintaining local update state items including an estimate time indication related to update communications received by the local master server about the directory server data stored by the designated master server. A master server may also include an upper time builder for evaluating an upper time value that is the earliest one of the estimate time indications in the local update state items. A master server may also include a master-to-non-master replicate function, for sending to the non-master server the updates in the local directory server data which have an associated creation time no later than the upper time value.

Abstract: The invention proposes a directory server system having a master server and a non-master server, each server being capable of storing directory server data comprising updates.

Abstract: The invention proposes a master server, for use in a directory server system having other master servers and a non-master server, each server being capable of storing directory server data, comprising updates, each update having a creation time. The master servers are capable of exchanging replicate updates through update communications.