In testing the Micron P420h, along with all enterprise drives, we focus on long term stability. In doing so, we stress products not only to their maximum rates, but also with workloads suited to enterprise environments.
We use many off-the-shelf tests to determine performance, but we also have specialized tests to explore specific behaviors we encounter. With enterprise drives, you will see that we do not focus on many consumer level use-cases.
Our hope is that we present tangible results that provide relevant information to the buying public.
To specifically measure latency, we use a series of 512b, 4K, and 8K measurements. At each block size, latency is measured for 100% read, 65% read/35% write, and 100% write/0% read mixes.
It’s unfortunate that we had so much write latency at 512 bytes, because it completely overshadows the performance at 4KB and 8KB, and read operations in general, which were really good.
We see the same thing with maximum latency, where 512 bytes latency is off the charts compared to the other metrics. Read latency is particularly impressive, where the maximums were very low.