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How fast is fast storage under Linux? In many important situations, the Linux kernel must provide bandwidth and latency guarantees in the access to storage. Examples range from guaranteeing a high responsiveness in a system doing intense I/O, to supporting at least the minimum quality of service required by cloud storage or by WEB and video-streaming services. The common solution used in Linux to provide these service guarantees is I/O throttling, especially with modern, fast SSDs. But, as surprising as it
