I don't know what you mean by primary and secondary server. Are you talking about replication, HADR, or something else. Neither Replication nor HADR are supported in the free version of DB2 Express-C.
Please do not confuse the following products, which are all different:
- DB2 Express-C (free)
- DB2 Express-C FTL (not free)
- DB2 Express (not free)
If you purchase DB2 Express-C FTL, you will get Replication and HADR included. Cost is $2,995 USD per year, per server.