128KB SEQUENTIAL READ/WRITE
Sequential performance is measured similarly to the other two tests before. The drive is first secure erased to get it in a clean state. Next, we precondition the drive with a 128KB sequential write workload at QD256 until the drive is in a steady state. Finally, we cycle through QD1-256 for 5 minutes each for writes and then reads. All this is scripted to run with no breaks in between. The last hour of preconditioning, the average MB/s, and average latency for each QD is graphed below.
The DC400 averages 525-530MB/s write, during preconditioning. Just as we saw with the 4K and 8K tests, the over provisioned model delivers better consistency.
In sequential testing, the DC400 is about on par with every other SATA SSD out there. It averages about 560MB/s read and, as we just stated, about 525MB/s write performance in each capacity.