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Toshiba HG6 THNSNJ512GCSU Enterprise SSD Review

By: Paul Alcorn | SSDs in IT/Datacenter | Posted: Sep 16, 2014 9:10 pm
TweakTown Rating: 91%Manufacturer: Toshiba

4k Random Read/Write




We precondition the 512GB Toshiba THNSNJ512GCSU HG6 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 (Outstanding I/O) 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 Toshiba HG6 averages 67,693 IOPS, and the Toshiba HK3R averages an impressive 83,266 IOPS at 256 OIO. The Toshiba HK3R is second only to the Samsung 845DC EVO, which delivers 85,155 IOPS at 256 OIO. The HG6 random read performance isn't chart-topping, but it is sufficient for most moderate workloads.






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 HG6's incrementally slower random read performance results in 67,030 IOPS at .1ms; the HK3R provides 83,000 IOPS at .1ms, and the 845DC EVO delivers 85,000 IOPS.




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


Under a sustained heavy 4k write workload, the Toshiba HG6 scores 7,544 IOPS at 260 OIO, the HK3R averages 17,437 IOPS, and the 845DC EVO averages 13,841 IOPS. The HG6 has lower speed in this sustained workload, but in bursty operating system environments, this will not be as much of a concern. It does exhibit a nice, tight performance profile that is a welcome sight. This type of consistent performance yields tremendous gains in RAID environments.






The HG6 is clearly not intended for sustained write workloads, and falls well behind the competing SSDs in this test. Even though there was a tight performance profile with the IOPS output, the latency exhibits some variability.




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 HG6 makes a nice gain in performance consistency in this test, albeit at the sacrifice of some performance.




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 low power consumption of 2.95 watts is an excellent characteristic for an SSD headed into varying applications, including mobile. The HK3R averages 3.85 watts, and the 845DC EVO averages 3.55 watts.




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 the HG6. The low power consumption does not entirely offset the lower write performance, and the HG6 scores 1,862 IOPS per watt. Write efficiency metrics are not going to be a huge concern for a SSD headed into light read workload environments. The HK3R averages 4,249 IOPS per watt, and the 845DC EVO averages 3,973 IOPS per watt.

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