# Start Sharing and Synchronizing Data Throughout the Cluster

For MiVoice Business network or cluster elements that are running 3300 ICP Release 6.0 or later software, use System Data Synchronization (SDS) to start sharing data among the elements, and if necessary, perform a sync operation to make the required data consistent across all the elements. See Cluster Configuration Notes for a list of the forms that you need to program with the same data.

SDS supports the sharing and synchronization of

- system data among the elements

- resilient user and device data between primary and secondary controllers

- telephone directory data.