Adding new data source lose existing data

HI

I am using tranquillity server for ingest data in Druid. Earlier i have one data source in server.json,recently i have added one more data source in server.json which lead existing data lose. I did following step,Please let me know where i am wrong

  1. Stop Tranquillity server.
  2. Add one ore datasource in server.json
  3. restart server again
  4. lost old data
    Thanks

Anil