Understanding Private Cloud Storage
Posted by
Howard Marks
November 30, 2009
Partly Cloudy
Given the attention that cloud computing garners these days, some vendors are rebranding existing offerings as private cloud options. This can be frustrating for potential buyers, but religious arguments over what constitutes a cloud are less important than features, capabilities, and cost.
Caringo and HDS have repositioned their content addressable storage (CAS) and redundant array of independent nodes (RAIN) systems as private cloud storage. There are some similarities. For instance, CAS/RAIN architectures tend to be built with less-expensive disks than you'd find in an enterprise SAN.
However, vendors have traditionally positioned CAS/RAIN architectures for archiving and compliance. Those use cases require more-advanced features than most private cloud providers offer, such as deduplication, or the ability to set retention and disposition policies or use hash algorithms to demonstrate that objects haven't been changed after they're saved. These advanced features let vendors charge a premium, which starts to push these products outside the low-cost boundary of a private cloud. In addition, the amounts of data CAS/RAIN storage systems are intended to hold are usually smaller, and have lower performance requirements, than a private cloud architecture.
The CAS/RAIN vendors aren't the only ones using cloud labels to fog up product categories. Vendors like IBM and Symantec have repackaged their clustered file systems into private clouds. Symantec FileStore software wraps Storage Foundation, and its integrated VxFS clustered file system, in a package that's easier to install and manage. IBM's Smart Business Storage Cloud leverages its GPFS clustered file system along with XIV clustered block storage (and of course, IBM services).
While cluster file systems can deliver impressive performance, their reliance on expensive back-end storage makes them relatively pricey compared with RAIN architectures. Cluster file systems are more appropriate to applications, like render farms, that require high performance for individual clients.
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