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Samsung PM853T 960GB Enterprise SSD Review

By: Paul Alcorn | SSDs in IT/Datacenter | Posted: Sep 23, 2014 11:05 pm
TweakTown Rating: 91%Manufacturer: Samsung

4k Random Read/Write




We precondition the 960GB Samsung PM853T 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 blue 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 PM853T averages a tremendous 85,265 IOPS at 256 OIO (Outstanding I/O), and the Samsung 845DC EVO comes close with 85,155 IOPS. The Micron M500DC averages 56,259 IOPS, and the Intel DC S3500 averages 57,769 IOPS. Both Samsung 3-bit MLC entrants dominate the chart with outstanding performance in 100% random read environments.






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 SSDs that are lowest and furthest to the right exhibit the most desirable latency characteristics.


Both Samsung SSDs deliver 85,000 IOPS at .1ms, the DC S3500 provides 57,000 IOPS at.1ms, and the M500DC provides 56,000 IOPS.




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


The PM853T bests its smaller-capacity sibling with an average of 17,482 IOPS, while the 845DC EVO averages 14,980 IOPS, slightly above the DC S3500 and its 13,841 IOPS average. The Micron M500DC is terrific with 39,089 IOPS at 256 OIO.






The Micron M500DC is on an island with superb latency during the 4k write workload. The M500DC easily beats the rest of the field.




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 large capacity of the PM853T resists staying in a steady state during this long test. It cuts an impressive swath across the chart, beating the Intel and 845DC EVO.




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.


It is important to note the PM853T has double the capacity of the other SSDs in the test pool. This will adversely affect its comparable power measurements due to increased componentry. Readers should also consider the watts per GB of useable capacity. The PM853T averages 3.97 watts; the 845DC EVO weighs 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 test power consumption and efficiency from write workloads, which is not the intended workload for low-endurance SSDs. The PM853T averages 4,774 IOPS per watt; the 845DC EVO averages 3,973 IOPS per watt; and 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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