Enterprise Modernization (EM) is about understanding the existing infrastructure and then see what else you need in terms of Modernization (Solution). Unlike other spectrums, EM does not give you great flexibility to just pick and replace something (part of h/w or s/w) unless that entity works independently and does not pose any risks (which is very unlikely).
The challenge here to to completely understand the product/solution to its core and determine if the product/products can be used in some other way, better way to suite/cater to your new requirements. So, If you think that the existing product/Product Suite/architecture cannot cater to your new requirements, THINK AGAIN
IBM Rational Host On-Demand provides a way for the administrators to manage data associated with one of more HOD servers (End user and their session related information) from a single LDAP Server. Many clients, to this day have put this solution in place. Using HOD, LDAP or flat files are the only ways for organizations to centrally store/load/manage user and session related information.
If the use of LDAP is not an option and you have your own data store (for example RDBMS) and you want to use that instead of the conventional HOD Server to authenticate
end users or modify the session properties on the fly. You can do that using HOD's Dynamic Overrides ("Modifying session properties dynamically")
I have not seen many customers using this, though this is one of the clean and simple ways, if you need to administer data from a separate data store. Probably one of the reasons is because some amount of code needs to be put in place to get this setup working, But if you see the amount of code is not much and also you get a lot of flexibility to develop and implement your own authentication mechanism and any additional business logic.
Want to Know more, Be there @ #innovateIndia 2011 - Bangalore
Chief Programmer - IBM Rational Host On-Demand
India Software Labs - Bangalore
Disclaimer : The postings on this site are my own and don't necessarily represent IBM's positions, strategies or opinions.