4K Random Read/Write
We precondition the Samsung SM843 for 18,000 seconds, or five hours. Every second we are receiving reports on several parameters of the workload performance. We then plot this data to illustrate the drives' descent into steady state.
This chart consists of 36,000 data points. The black dots signify the IOPS during the test, and the light brown dots are the latency encountered during the test period. We place the latency data in a logarithmic scale to bring it into comparison range. This is a dual-axis chart with the IOPS on the left and the latency on the right. 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 the point that high-granularity testing can give our readers a good feel for the latency distribution by viewing IOPS at one-second intervals. This should be in mind when viewing our test results below.
We provide histograms to provide further latency granularity below. This preconditioning slope of performance happens very few times in the lifetime of the device, and we present these test results for the tested device only to confirm the attainment of steady state convergence.
Each QD for every parameter tested includes 300 data points (five minutes of one second reports) to illustrate the degree of performance variability. The line for each QD 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 SM843 averages an impressive 69,654 IOPS in random 4K read speed at QD256. This is higher than all other SATA SSDs, except the SMART Optimus. The Micron P400m averages 53,847 IOPS, the Intel DC S3700 64,533 IOPS, and the SMART Optimus 93,860 IOPS.
Garbage collection routines are more pronounced in heavy write workloads. The Samsung SM843 averages 12,313 IOPS in 4k write at QD256. This is well below all of the competing solutions. The Micron P400m averages 26,815 IOPS, the Intel DC S3700 36,428 IOPS, and the SMART Optimus 43,081 IOPS.
Our write percentage testing illustrates the varying performance of each solution with mixed workloads. The 0% column to the left is a pure read of the 4K file size, and as the charts progresses to the right we illustrate a pure 4K write workload.
The Intel and SMART Optimus perform very well with this test, and the Micron and SM843 come in at the bottom of the chart. The SM843 provides steady performance from the 10% to 60% range, but then falls to an average of 13,000 IOPS at a 100% 4k write workload.
The SM843 exhibits a wide range of latency during the measurement window. There are sporadic bursts of latency that are far above the other SSDs tested. Overall, the SM843 does not demonstrate a very tight latency range in this test. 40% of I/O was served in the 10-20ms range, 16% in 4-6ms, 12% in 8-10ms, 11% in 6-8ms, and then an entire smattering of ranges that peaks at 200ms.
The power consumption measurements, taken during our precondition run, for the Samsung SM843 are very good. The SM843 averages 2.79 Watts, the lowest among the tested devices. The Micron 3.5 Watts, in comparison to the Intel at 4.36 Watts and the SMART Optimus at 6.51 Watts.
The SM843 provides 4,407 write IOPS per Watt. The P400m 7,624 IOPS, the Intel 8,336 IOPS, and the Optimus 6,617 IOPS.
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