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Samsung SM843T 480GB Enterprise SSD Review

By: Paul Alcorn | SSDs in IT/Datacenter | Posted: Sep 15, 2014 9:14 pm
TweakTown Rating: 92%Manufacturer: Samsung

4k Random Read/Write




We precondition the 480GB Samsung SM843T 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 one of the most sought-after performance specifications.


The Samsung SM843T averages 62,015 IOPS at 256 OIO (Outstanding I/O). The Samsung SM843 leads the chart with 95,815 IOPS. The Micron P400m averages 55,530 IOPS, and the Intel DC S3700 averages 76,301 IOPS. The SM843 is much faster than its high-endurance counterpart at random read.






Our Latency vs IOPS charts compare the amount of performance attained from each solution at specific latency measurements. Many applications have specific latency requirements. These charts present relevant metrics in an easy-to-read manner for readers who are familiar with their application requirements.


The SM843T provides nearly 62,000 IOPS at .1ms; the SM843 delivers 96,000 IOPS; the DC S3700 provides 76,000 IOPS; and the P400m provides 57,000 IOPS.




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


The SM843T averages 16,950 IOPS at 256 OIO; the P400M averages 31,026 IOPS; the SM843 averages 12,432 IOPS; and the Intel DC S3700 with 33,841 IOPS. The original SM843 is very speedy with pure random read workloads, but doesn't fare as well in heavy write workloads. The SM843T offers stronger performance in heavy write workloads, but doesn't muster the unabated write speeds of the Intel and Micron. The SM843T provides a much tighter performance envelope during the test period, highlighting its focus on predictable latency performance.






The Intel DC S3700 and Micron P400m separate themselves from the pack in this test.




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 Intel easily leads this test with all write mixtures. The SM843 predictably leads the high read test, but falls quickly as we mix in heavier write activity. The SM843T performs well in heavier read workloads, but begins to lose steam as we mix in heavier write activity.




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 SM843T averages 3.38 watts, and only the SM843 is lower with its average of 2.86 watts. The P400M averages 4.00 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 SM843T averages 5,071 IOPS per watt, placing it near the SM843 with its average of 4,621 IOPS per watt. The DC S3700 averages 8,930 IOPS per watt, and the P400m weighs in at 7,684 IOPS per watt.

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