Mixed Read / Write Workloads
In this series of tests, we measure mixed workload performance. We start with 100% read and then add data writes to the mix until we get to 100% writes, in 10% increments. We believe this will be the next major area SSD manufactures will address after performance consistency.
Sequential Mixed Workload Bandwidth
All SSDs lose performance with a mixed workload. SATA is half-duplex so the drive has to receive all of the commands and use native command queuing to prioritize the requests. Looking at the test through a LeCroy Teledyne Sierra M6 analyzer we can see how the drives tend to work the read load first and then handle the write requests.
The 850 Pro 512GB has some trouble early on when a small amount of write requests are added to the mix, but quickly regains performance as more writes are introduced.
80% Read / 20% Sequential Write Bandwidth
For consumers, the 80% read and 20% write mix is a good place to measure. The 850 Pro isn't the best at this mix, but it's certainly not bad either.
Random Mixed IO 50/50 Workload
The random 50/50 mix is a new test we're introducing in this review. At this time we only have a few new SSDs tested in this capacity size but as we finalized the test we'll go back and retest all of the market leaders.
The Samsung 850 Pro shows a significant lead compared to the other 512GB capacity class drives in the chart. Surprisingly, the 850 Pro even increases performance at QD64 over QD32. This shows the drive is able to effectively execute high command requests.
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- Page 1 [Introduction & Specifications, Pricing and Availability]
- Page 2 [Samsung 850 Pro 512GB SSD]
- Page 3 [Samsung Software Package]
- Page 4 [Test System Setup and ATTO Baseline Performance]
- Page 5 [Benchmarks - Sequential Performance]
- Page 6 [Benchmarks - Anvil Storage Utilities]
- Page 7 [Benchmarks - Mixed Read / Write Workloads]
- Page 8 [PCMark 8 Consistency Test]
- Page 9 [PCMark 8 Consistency Test - Continued]
- Page 10 [Benchmarks - Power Testing]
- Page 11 [Final Thoughts]
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