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Dave Donatelli, who is (or at least was) HP's Executive Vice President and GM of Enterprise Servers, Storage and Networking sat for an interview and laid out the conceptual differences pretty succinctly:
"Unified storage attempted to help customers deal with the complexity and inefficiencies of storage capacity management by taking multiple architectures and putting them in a single box.
“That was probably a useful tool in the last decade, but this decade we have a different set of issues where figuring out how you put things into the box is not the problem,” Joyce said.” It’s how do you deal with the sheer scale of everything customers are dealing with,” including multiple applications and increasing volumes of structured and unstructured data, aka Big Data.
With converged storage, HP is trying to accomplish three goals, Joyce said. First, it is trying to take advantage of converged infrastructures and build storage architectures on common platforms leveraging open blade servers.
Second, HP is building as much commonality into its storage software components as possible, where IBRIX, LeftHand, StoreOnce and 3Par are seen as building blocks, not separate products.
Finally, on top of that, “we want to converge the management experience as much as possible” across the entire converged infrastructure – storage, servers and networking, Joyce said."