To read more on our test methodology visit How We Test Enterprise SSDs, which explains how to interpret our charts. The most crucial step to assuring accurate and repeatable tests starts with a solid preconditioning methodology, which is covered on page three. We cover workload performance measurements on page six, explain latency metrics on page seven and explain QoS testing and the QoS domino effect on page nine.
The SanDisk SX300 SSDs experience extensive variability during this mixed workload, which leads to a somewhat confusing chart for the uninitiated. The SX300's scattered performance stands out in stark contrast to the Intel SSDs, which offer nice razor-thin performance groupings during the test. SanDisk unabashedly tunes the SX300 to provide the best performance in light workloads, which is where the majority of applications reside. This tuning results in unique performance characteristics during heavy mixed workloads, and these test results mirror the characteristics we observed with a single SSD in our Fusion ioMemory product evaluation.
It is worth noting that the 16-SSD SanDisk array holds the lead from 4 to 256 OIO in average IOPS, and the Intel 16-SSD array takes a significant lead with 1,008,304 IOPS at 1,024 OIO. We are accustomed to observing around 160,000 IOPS with the fastest PCIe SSDs in this workload, so blasting through the 1 million IOPS barrier is particularly impressive. The SanDisk array provides 500,000 IOPS at 0.2ms, which is a noteworthy achievement. The Intel arrays also offer an impressive QoS profile during the measurement window.
The SanDisk arrays continue to exhibit the same performance profile and lead under the 256 OIO threshold, and the Intel 16-SSD array smashes through the 1 million IOPS barrier again in this write-centric mixed workload. Both 8-SSD arrays fall within a similar range of performance under heavy load, but the SanDisk arrays maintain the lead under light load, and the 16-SSD SX300 array provides nearly 600,000 IOPS at 0.2ms.
The 16-SSD Intel array, however, takes the lead in our QoS measurements and also offers solid standard deviation metrics.