Most storage vendors are happy to just add flash to their existing product lines, often using it as cache, or as a storage tier handled transparently within the array. Few vendors take the opportunity to rethink the way storage works, though, from the basics of performance to how it meshes with the idea of public & private clouds. Coho Data, coming out of stealth mode with their first product, the DataStream, does just that.
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In Applications Performance Equals Response Time, not Resource Utilization, we took the position that while for the majority of the applications deployed on physical hardware the general practice was to infer their performance by looking at normal vs. abnormal resource utilization statistics, once you virtualize an application, it becomes necessary to directly measure its response time in order to ensure adequate service to business constituents and end users.
Managing licensing and utilization costs is a mess today in the physical world. Introducing elastic scaling of workloads into a hybrid private/public cloud introduces new uncertainties and new software licensing metering and compliance issues. This is particularly true in the case of enterprise applications which are licensed by the enterprise from the software vendor and then deployed on an as needed basis on Iaas or PaaS clouds.