Synthetic Performance Testing
We brought all three 883 DCT capacities to this review. Joining the 883 DCT models, we included a Samsung PM863a and Seagate Nytro 1351, both in 3.84GB capacities.
Sequential Read Performance
Through most of the review, you will find all three Samsung 883 DCT drives perform nearly identical. There are a few places where the 3.84TB performs slightly better due to more overprovisioned area, and the 1.92TB is in the middle with the advantage coming in more write-intensive workloads.
Sequential Write Performance
After testing a number of enterprise SSDs over the previous months, we've noticed the SATA models generally show less performance consistency compared to those using NVMe. The Seagate Nytro 1315 in the 128KB Sequential Write chart with the OIO scaling shows consistent performance. The IO dots converge to form a line.
The Samsung 883 DCT drives, as well as the older PM863a, show more variation in the IO in this write test.
Sequential Mixed Workload Performance
The mixed workload results show the deviation with the 883 DCT drives at 90% and 80% reads. The drives clean much of that up by 70% reads. You will also notice there isn't a heavy bathtub curve with any of the drives tested today. With consumer SATA SSDs, we usually see a deep performance dip in the middle of the chart with progressive increases to the edges.
Random Read Performance
The 960GB 883 DCT shows slightly better random read performance over the other two 883 DCT capacities. The three drives all level off around 100,000 IOPS, but at lower queue depths, the 960GB shows superior performance.
In an upcoming article, we will show the performance of several SATA and NVMe SSDs as read cache in a new enterprise NAS system. The 883 DCT performs remarkably well in this role thanks to its high random read performance.
Random Write Performance
The 883 DCT series doesn't use an SLC cache like consumer models like the 860 EVO and 860 QVO. The Seagate Nytro 1351 does use a SLC buffer, and you can see how the cache runs out of steam in the preconditioning chart. What you don't see is the amount of processing power that goes into managing the SLC in an environment that doesn't take advantage of the feature.
Random Mixed Workload Performance
The more the Samsung 883 DCT SSDs get away from a 100% read or write load, the more inconsistent the performance. This is very common with all SSDs as the mix increases the latency. NVMe SSDs generally have a tighter performance cluster since the interface is bidirectional, unlike SATA.
The important takeaway from these two charts is the improvement from the older PM863a. You can see the largest gains in the 90% and 80% read workload.