We then use this formula to derive the average disk access latency for each application, when given a cer- tain quota of the disk bandwidth. We assume that think time per thread is negligible compared to request pro- cessing time, ., we assume that I/O requests are ar- riving relatively frequently, and disk access time is sig- nificant. If this is not the case, the I/O component of a workload is likely not going to impact overall application performance. However, if necessary, more precision can be easily afforded ., by a context tracking approach, which allows the storage server to distinguish requests from different application threads [25], hence infer the average think.
