The Repository Layer provides storage for the platform and consists of the content repository, which uses file stores and a relational database as its components. The file store is a logical storage area and can be a file system of the host operating system (OS) or a Content-Addressed Storage (CAS), such as EMC Centera. CAS uniquely identifies a content item using a digital fingerprint (also known as ID or logical address) of the content item rather than a file system path of the content item. Other alternatives such as streaming servers and even relational databases can be used as file stores.
Optionally, the repository can also maintain a full-text index of all text-based content assets stored within the repository. For example, such content may include documents, text files, HTML files, XML content, and close-captioned video content.
In a Documentum deployment, the Content Server, the file store, and the database can all be hosted on separate physical machines...