Latency traktor nicecast5/5/2023 You will often find that vendors specify the average latency of their system. So, when you’re evaluating the performance of a storage system, the key metric to understand is the “guaranteed maximum latency.” Very few flash arrays have made the effort to maintain a consistently low latency, despite it having a significant impact on actual performance and the overall cost of running applications. While this provides great value to computing environments, it is important to note that the actual performance of individual flash storage systems can vary by as much as a factor of 10! With the evolution to flash memory, latency has moved into the microsecond category. ![]() ![]() When disk drives were the primary storage medium, time was measured in milliseconds. With storage, we face a unique challenge the primary factor in performance is the speed at which data can be read or written. Likewise, increasing the number of cars a highway can handle won’t make any difference in performance if the highway is not congested. ![]() Returning to our analogy, if you are commuting on a highway with no traffic, increasing the number of lanes won’t reduce your commute time. ![]() Transaction latency is the core “value metric.” With latency, faster is always better.
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