ORLANDO — Grid storage and storage clusters — are the terms interchangeable? They could be if you ask users and industry analysts who participated in several panels at Storage Networking World this week.

There was a lot of confusion at this show as to what makes up a storage grid and how it differs from a cluster.

“If I think of the two or three technologies that are known for the greatest amount of conjecture, disagreement and confusion, grids and grid storage would be right up there,” said Simon Robinson, senior analyst for the 451 Group and moderator of the panel on grid infrastructure.

Paul Strong, a distinguished research scientist, has a storage grid installed at eBay in San Jose that consists of two petabytes of capacity. His grid grows by 75 data volumes and 10TB of storage per week.

“At eBay, we consider our grid to be the underlying storage fabric,” said Strong. “The issues we have with the grid is its ability to scale and agility to change. Management of the grid is complicated and hard. We are looking to move away from managing bits, bytes and blocks of data, and deploying software, technology and standards that can manage the grid as a single entity.”

To do so, Strong called for standards and software for managing storage grids. Matthew Brisse, technology strategist in the Office of the CTO at Dell, who presented on grid architectures at the show, agreed.

“We’re not there yet,” said Brisse, adding that much of the middleware software that manages the grid is not available.

“Grid-based storage is storage that has grid attributes associated with it, meaning an orchestration middleware layer with its own quality of service capabilities, a scheduling layer that distributes the tasks on the grid, and a set of business policies that manage the cluster of computers and storage,” he said.

Brisse is working with the Storage Networking Industry Association, one of the sponsors of Storage Networking World, which launched a Grid Task Force last year. The objective of the task force is to work with the Open Grid Forum to develop a grid proposal and standards that will help companies deploy grids.

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