HDS is claiming to support up to 20 Pbytes in an 80-node archive system. If proveable, that represents a step up from what other vendors, including EMC, lay claim to. (EMC, for instance, prefers to say it supports 64 Tbytes per Centera cabinet and that an unspecified number of cabinets can be linked.)
HDS also claims it can support as many objects in an archive with third-party storage as with HDS arrays. But customers will pay $250,000 and up for the USP V to act as intermediary. Otherwise, pricing for HCAP in general varies with the kind of HDS storage used, and a typical 5-Tbyte system starts at about $70,000.
While it's not possible to verify any vendors' CAS claims outside the lab, at least one analyst says HDS has significantly improved its CAS approach. "It's a great solution for HDS customers -- and others -- because of its ability to scale in terms of capacity and objects per node," says analyst Laura DuBois of IDC.
HDS has also attempted to address other problems that affect CAS users. On the security front, access to the new HCAP isn't possible without all objects being active, since nodes deploy a patent-pending "secret sharing" method. This ensures data can't be recovered from stolen disks, HDS says.
De-duplication comes with hashing algorithms to ensure users don't delete a file when archiving it. HDS also has made automated replication using an object-based approach a direct feature of HCAP, instead of requiring an additional host to achieve policy-based replication.
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