Latency

Latency is critical and requires extra care, as some applications are significantly sensitive to high latencies or response times.

Latency is a measurement of the amount of time I/O operations take to complete that is typically measured in milliseconds (1 second is 1,000 milliseconds). High latencies or response times cause applications to take longer to respond and even stop working altogether.

Aim for the lowest latency possible. This is a case where getting the lowest possible number is always the best approach. With latency, there's no such thing as not enough, or, in this case, not too short of response time. Consider the type of storage medium you used. Traditional hard disk drives have response times (or seek times) ranging in the several hundred milliseconds, while newer solid state drives can go past the sub-millisecond mark and into microseconds.