The procedure is valid on Management, Indexer and Collector servers.

1. Stop the Data Insight services on the Server
2. Modify the C:\Program Files\DataInsight\datadir.conf to point to new location (example E:\DataInsight\data)
3. Copy the /data to the new location (example E:\DataInsight\data)
4. Go to C:\Program Files\DataInsight\bin via command prompt
5. Execute following command [Do not copy paste]
configdb -c
                The output should point to the new location say E:\DataInsight\data
configdb -p -T node
                It should list the Data Insight servers in the deployment.
6. Start the Data Insight services on the Server
7. Once all services are started successfully, you can delete C:\DataInsight\data