Today, competitors big and small, including Caringo, Hewlett-Packard, Hitachi, IBM, Nexsan and Sun Microsystems, are bullish on CAS. We expect every major storage vendor to provide some iteration of CAS, albeit under the guise of a "complete archive-management system." Some have entries already, and we expect others to follow suit in the next 24 months.
How It Works
A CAS system comprises storage nodes, where data is physically kept, and access nodes, where metadata and information on the data's location on the storage nodes are kept. As new documents are passed to a CAS device, they are hashed, then stored based on that hash rather than any kind of directory table. Data is retrieved by requesting the resulting hash. CAS can cut down on duplication, and thus storage space requirements. Documents with even a small change will be saved separately from the original copy--the new version will hash differently--providing digital fingerprinting and versioned storage. Some vendors use this capability to keep only one copy of a given data set, removing the duplicates usually found on standard location-addressed storage.
As you may have deduced, because of the additional hash and metadata processing, CAS is best-suited for static documents. Thus the main use for CAS is data archiving. CAS' ability to track data, eliminate duplication and provide a foundation for archive management has never been more relevant: Companies are digitizing thousands of data types previously kept in analog format while also storing customer calls, security surveillance videos, invoices and more. CAS unarguably provides the rich metadata and data-change integrity features enterprises need to keep track of disparate data as it is marked it for retention until a certain date and migrated to other storage tiers.
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