What is content addressable storage?
Content Addressable Storage (CAS) is a storage mechanism in which fixed data is assigned a permanent storage location on a hard disk and addressed with a unique content name, identifier or address. EMC Corporation first introduced CAS for its distributed data management (DDM) software.
CAS is also known as associative storage, content-oriented storage or fixed content storage (FCS).
CAS enables more efficient storage and access to fixed data that generally does not change over time. It enables companies to archive and retrieve large amounts of data for longer retention periods, especially to meet regulatory requirements.
CAS stores each data object on a hard drive and assigns it a unique content address / identifier. Once the data object is saved, it cannot be duplicated, modified or deleted. To access the data, a user or application must provide the content address or identifier of the data.