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Toshiba PX02SS 12Gb/s SAS3 Enterprise SSD Review

By: Paul Alcorn | SSDs in IT/Datacenter | Posted: Apr 2, 2014 2:03 pm
TweakTown Rating: 92%Manufacturer: Toshiba

4k Random Read/Write




We precondition the Toshiba PX02SS for 9,000 seconds, or two and a half hours, receiving reports on several parameters of workload performance every second. We then plot this data to illustrate the drive's descent into steady state.


This chart consists of 18,000 data points. This is a dual-axis chart with the IOPS on the left and the latency on the right. The red dots signify IOPS during the test, and the grey dots are latency measurements during the test period. 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 illustrates that 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 happens very few times in the lifetime of the device, typically during the first few hours of use, and we present the 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. One of the most sought-after performance specifications, 4k random performance is a heavily marketed figure.


The Toshiba PX02SS averages 117,289 IOPS with a 4k random read workload at 256 OIO (Outstanding I/O), but its peak is at 32 OIO where it delivers an outstanding 133,871 IOPS. The Toshiba PX02SM averages an impressive 124,550 IOPS. The HGST peaks at 256 OIO with 149,352 IOPS. Perhaps the only chink in the vaunted HGST SSD800MM's armor comes at 128 OIO, which is where it experiences a drop in performance. We conducted multiple tests with several measuring tools to affirm this odd occurrence, and it can likely be fixed with a firmware update.




The PX02SS and PX0SMF provide the best performance-v-latency at 32 OIO, while the HGST thrives at the higher 256 OIO.




Garbage collection routines are more pronounced in heavy write workloads. This leads to more variability in performance. We can see the benefits of the increased overprovisioning with the PX02SS providing 45,786 IOPS at 256 OIO and the PX02SM trailing at 28,602 IOPS. The PX02SM and PX02SS have the same controller and DRAM configuration; much of this performance increase is due to the increased overprovisioning. The HGST averages a stellar 64,279 IOPS at 256 OIO.




The PX02SS does not suffer nearly as much variability as the lower-tier PX02SM and seems to fall into the best performance at 64 OIO.




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


The PX02SS clearly exhibits a performance advantage over its sibling as we hit heavier write workload percentages.




We record the power consumption measurements during our precondition run. We calculate the stated average results during the last five minutes of the test, after the device has settled into steady state.


The PX02SS averages 5.85 watts during the measurement window, and the HGST provides a higher average of 7.56 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.


The Toshiba PX02SS averages 7,869 IOPS-per-Watt, while the HGST leads with 8,977. It is important to note the IOPS-per-Watts set forth in the specifications of both drives is with read activity. We measure IOPS-per-Watt with write activity.

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