How to add/initialize/start 2nd datanode on samedatanode server on already running ndb cluster

[G C]

I have already running ndb cluster with 2 datanode servers with 1 data node on each and 2 mgmt servers with mgmt srvs and mysqld srvs running on both.

Now I am planning to add 1 more data node onto 2 data node servers i.e. 1 on each.

I did reading, did the changes in config.ini and restarted the mgmt server, i Can see the entries with SHOW, but how to add/initialize the new datanodes from datanode servers?

Before I do ndbmtd --initialize I thought I verify with you.