How to Start the LDAP server (daemon)
idsdiradm -I <instance name>
To Start the LDAP admin instance
#idsdiradm -I <instance name>
OR
#ibmdirctl -I <instance name>
OR
#ibmdirctl -p 3550 -D cn=root -w secret start
-p for Port
-D for admin user
-w for admin user password.