So how does a customer measure some of these performance metrics to ensure they are getting a high-quality enterprise SSD? QoS metrics demonstrate that given a worst-case workload tested over a period of time, an SSD’s latency and IOPS profiles stay within a specified range (typically up to a minimum of 99.9% of the data points over a predetermined period of time) without having unexpected outliers causing a sudden drop in application performance. Storage Service Providers need to be able to manage and guarantee performance levels to their customers with a high confidence level. Kingston tests all the datacenter SSDs against “six nines of consistency”. That’s 99.9999% consistency.