After running dsmig migrate-data, if the error log of new instance contains lots of error messages, refer to the following steps:
Stop all the Directory Server running instances.
Remove nsslapd-infolog-area and nsslapd-infolog-level completely from the dse .ldif file.
Start the Directory Server instances.
After the migration process, if you get an error while changing your password using the ldapmodify command, refer to the following steps:
Check pwd-compat-mode using the following command:
dsconf get-server-prop pwd-compat-mode
If pwd-compat-mode is set to DS-6 mode, you must use the pwdPolicy objectclass while changing the password using the ldapmodify command.