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Samsung 845DC PRO Enterprise SSD Review

By: Paul Alcorn | SSDs in IT/Datacenter | Posted: Aug 27, 2014 6:01 pm
TweakTown Rating: 96%Manufacturer: Samsung

4k Random Read/Write




We precondition the 480GB Samsung 845DC PRO for 9,000 seconds, or two and a half hours, receiving performance reports every second. We plot this data to illustrate the drives' 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 red 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 illustrated 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 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. 4k random performance is a heavily marketed figure, and is one of the most sought-after performance specifications.


The Samsung SSDs blow past the competition with 85,334 IOPS for the 845DC Pro and 85,155 IOPS for 845DC EVO, at 256 OIO (Outstanding I/O). The Micron M500DC averages 56,259 IOPS, and the Intel DC S3700 averages 76,301 IOPS. Both Samsung SSDs deliver dominating performance in 100% random read environments. The performance is close enough between the two that the 845DC PRO obscures the EVO's results.






Our Latency v IOPS charts compare the amount of performance attained from each solution at specific latency measurements. Many applications have specific latency requirements, and for those familiar with application SLA requirements, these charts present relevant metrics in an easy to read manner.


The 845DC family leads convincingly with the lowest latency during 4k random read activity. The 845's deliver 85,000 IOPS at .5ms, while the DC S3700 provides 76,000 IOPS, and the M500 DC provides 56,000 IOPS.




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


The 845DC PRO leads convincingly with an average of 49,996 IOPS at 256 OIO. The DC S3700 provides 13,841 IOPS, and the Micron M500DC comes in second with 39,089 IOPS. The TLC-powered EVO trails by a large margin with 14,504 IOPS.






The 845DC EVO experiences some turbulence under heavy load at 256 OIO, but the 845DC PRO dominates this test with a tight band of consistent latency. The 845DC PRO delivers tremendous performance at 2ms -well above competing SSDs.




Our write percentage testing illustrates the varying performance of each solution with mixed workloads. The 100% column to the right is a pure 4k write workload, and 0% represents a pure 4k read workload.


The mixed workload tests are dominated by the 845DC PRO, which provides leading performance in every mixture.




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 PRO features by far the lowest power consumption with a 4k write workload at 3.09 watts, the 845DC EVO measures in at 3.55 watts, the M500DC averages 4.09 watts, and the DC S3700 averages 3.72 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.


The 845DC PRO easily leads with an average of 16,160 IOPS per watt, the 845DC EVO averages 3,973 IOPS per watt, the M500DC averages 9,545 IOPS per watt, and the DC S3700 averages 8,930 IOPS per watt.

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