It is no secret that storage performance in the cloud is one of the main challenges for applications. The storage performance problem in the cloud has multiple facets. It is not just low vs. high performance; it’s also the fact that performance varies over time, and one customer can impact the performance of others. There is also the issue of storage performance monitoring. How does one know if an application is running slowly because of storage performance, or because of other factors like networking, IO concurrency, latencies, etc.?