Here are the steps to setup LDAP authentication for EMC UnityVSA.
Login to Unisphere.
Select the cog in top right hand corner to open settings.
Select Users and Groups -> Directory Services
Enter LDAP server information
Click Verify Connection
If successful, Select Advanced
This is recommended since otherwise you will run into problems with assigned users and groups since a default user and group search path created for domain is "cn=Users,dc=domain,dc=com" which in most cases will not fit in your company's AD structure.
Select Users and Groups -> User management
Click + Sign
Select User or Group type
Select LDAP User
Enter username. Wish validation could have taken place for LDAP user or group at this point and not after entering all information.