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Samsung 845DC EVO Enterprise SSD Review

By: Paul Alcorn | SSDs in IT/Datacenter | Posted: Jun 28, 2014 4:27 am
TweakTown Rating: 92%Manufacturer: Samsung

4k Random Read/Write




We precondition the 480GB Samsung 845DC EVO for 9,000 seconds, or two and a half hours, receiving performance reports every second. We plot this data to illustrate the drive's descent into steady state.


This dual-axis chart consists of 18,000 data points, with the IOPS on the left and the latency on the right. The green dots signify IOPS, and the grey dots are latency measurements during the test. We place latency data in a logarithmic scale to bring it into comparison range. The lines through the data scatter are the average during the test. This type of testing presents standard deviation and maximum/minimum I/O in a visual manner.


Note that the IOPS and latency figures are nearly mirror images of each other. This illustrates high-granularity testing can give our readers a good feel for latency distribution by viewing IOPS at one-second intervals. This should be in mind when viewing our test results below. This downward slope of performance only occurs during the first few hours of use, and we present precondition results only to confirm steady state convergence.




Each level tested includes 300 data points (five minutes of one second reports) to illustrate performance variability. The line for each Outstanding I/O (OIO) depth represents the average speed reported during the five-minute interval. 4k random speed measurements are an important metric when comparing drive performance as the hardest type of file access for any storage solution to master is small-file random. One of the most sought-after performance specifications, 4k random performance is a heavily marketed figure.


The Samsung 845DC EVO blows past the competition with a beastly 85,155 IOPS at 256 OIO. The Micron M500DC averages 56,259 IOPS, and the Intel DC S3500 averages 57,769 IOPS. The 845DC EVO delivers dominating performance in 100% random read environments.




The 845DC EVO leads convincingly with the lowest latency during 4k random read activity.




Garbage collection routines are more pronounced in heavy write workloads, leading to performance variability.


The 845DC EVO manages to best the DC S3500 and its 13,841 IOPS, but the Micron M500DC is terrific with 39,089 IOPS at 256 OIO. The 845DC EVO and the Micron M500DC trade blows, with unrivaled read performance from the EVO and unchallenged write performance from the M500DC.




The Samsung and Micron feature consistent latency characteristics, but the Micron has much lower overall latency in the write workload. The DC S3500 experiences some turbulence under heavy load at 256 OIO.




Our write percentage testing illustrates the varying performance of each solution with mixed workloads. The 100% column to the right is a pure write workload of the 4k file size, and 0% represents a pure 4k read workload. Mixed workload testing reveals strengths and weaknesses that remain hidden during typical tests. In reality, much of the real-world data is going to feature mixed data.


The Micron and Samsung dominate opposite ends of the spectrum, but our mixed testing tends to separate the wheat from the chaff. The M500DC leads eight of the 11 tests with mixed workloads, but the 845DC EVO enjoys a lead over the Intel drive, especially with heavy read workloads.




We record power consumption measurements during our precondition run. We calculate the stated average results after the device has settled into steady state during the last five minutes of the test.


The 845DC EVO features low power consumption with a 4k write workload, weighing in at 3.55 watts. The M500DC averages 4.09 watts, and the DC S3500 averages 3.8 watts during the measurement window.




IOPS-to-Watts measurements are generated from data recorded during our precondition run, and the stated average is from the last five minutes of the test. We measure efficiency based upon the write workload, but we are addressing this shortcoming with new power testing equipment from ULINK Technology. In the coming weeks, we will provide read efficiency performance measurements as well.


The 845DC EVO averages 3,973 IOPS-per-Watt. The M500DC jumps to a big lead, averaging 9,545 IOPS-per-Watt, due to its outstanding write performance. The DC S3500 averages 3,125 IOPS-per-Watt.

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