8KB RANDOM READ/WRITE
To measure 8KB random read/write performance do the same preconditioning as we did for 4KB performance. The drive is first secure erased to get it in a clean state. Next, the drive is filled by sequentially writing to the RAW NAND capacity twice. We then precondition the drive with 8KB random writes 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 IOPS, and average latency for each QD is graphed below.
The 8K write preconditioning results follow similar to that of the 4K results. Here we can see a performance distribution of about 2-3K IOPS on average with the 800GB model being much more consistent.
At 8K the results are very similar to what we have seen at 4K, but simply at a file size twice that of 4K and thus latency results are about double and IOPS are about half. The DC400 delivers nearly 40K IOPS read at both capacities, however, the over provisioned model delivers triple the write performance at 15K IOPS.