CAS systems store and locate files using addresses based on the file's content, rather than a physical location address. CAS systems are typically used for long-term storage of content that does not require frequent access or where it is stored for regulatory purposes.
When a CAS system stores content, it generates a unique key or hash, which is based on the content. The hash is generated from the content properties, such as the name, date, or content itself.
An example hash might be EQM2GC012MC77e72B24N2MMFU59G418ACSAIE70BAS340TN3E1JJL. This hash is then used as the address of the stored content, and which is then used to retrieve the content. When a request is made to the CAS using this address, it returns the associated content.
- Content can be located easily even in large volumes of data
- Content integrity: if stored content has been altered then there is a mismatch between the hash passed as the address and hash computed on the fly
- Avoids redundancy by recognizing that the hash is already present and so does not store it again
The Alfresco EMC Centera Connector module addresses the Centera store directly through its native API.
The module uses a series of properties to control the way that you access the store. A feature of this module allows you to set retention policies, such as, preventing content from being deleted for a period of time (for example, retaining invoices for seven years).
The Alfresco EMC Centera Connector module can be applied to Alfresco Enterprise 4.2.0 or later.