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Yes, if you can satisfy your availability requirements with LDAP, go for it, you will not need this component. If your LDAP does not have the availability you need, or if you need improved availability for features that LDAP does not support (e.g. if an LDAP server goes down you might have a minute of unavailability, permission information (might not be provisioned to ldap, or maybe you want to use server processed limits), etc) then maybe you need this feature...