Stop HADR:

1. Login to Production site as db2 username
2. command: db2 stop hadr on db <dbname>
3. Login to Target site as db2 username
4. command: db2 deactivate db <dbname> (this action not stop your DB2 services)
5. command: db2 stop hadr on db <dbname>

Start HADR:

1. Login to Target site as db2 username
2. command: db2 deactivate db <dbname>
3. command: db2 start hadr on db <dbname> as standby
4. Login to Production site as db2 username
5. command: db2 deactivate db <dbname>
6. command: db2 start hadr on db <dbname> as primary