4k Random Read/Write
We precondition the 960GB SanDisk CloudSpeed Eco for 9,000 seconds, or two and a half hours, receiving performance reports every second. We plot this data to illustrate the drive's 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 green 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 illustrates 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. We include a smaller embedded chart that lists performance at the highest load for easy interpretation.
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 CloudSpeed Eco places second in random read performance with 85,042 IOPS.
Our Latency v 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 CloudSpeed Eco takes second place in our Latency-v-IOPS testing, and the random read performance outpaces the Micron M500DC and Intel DC S3500.
Garbage collection routines are more pronounced in heavy write workloads, leading to performance variability.
The Eco places third in our random write testing, but displays a consistent performance profile with less variability than the HK3R2, and the M500DC.
The Micron M500DC has the best overall latency in the write workload, and the CloudSpeed Eco takes third place.
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 CloudSpeed Eco experiences variability in the 40-90% write mixtures, highlighting its recovery mechanisms at work during the measurement windows. The average speed beats all but the M500DC in those write mixtures.
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.
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 CloudSpeed Eco's efficiency places third in the test.
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