RAID 0 4k Random Read/Write
We precondition the array of 24 Micron P400m SSDs 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 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 only happens 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. One of the most sought-after performance specifications, 4k random performance is a heavily marketed figure.
This decidedly brutal workload is not something the HighPoint Rocket 750 will be subjected to often, but it manages to provide an average of 129,103 IOPS at 256 OIO, and 132,136 IOPS at 64 OIO. Keeping things in perspective, the fastest 15k HDDs deliver roughly 540 IOPS, so 40 of them would only provide 21,600 IOPS. The Rocket 750 could easily provide that speed with plenty of room to spare.
The Rocket 750 provides excellent latency at lower queue depths, and would easily handle any array of HDDs.
Once again, the Rocket 750 provides plenty of transactional performance for HDD arrays with an average of 113,706 4k write IOPS at 256 OIO.
The latency performance of the Rocket 750 scales well as we add in heavier workloads.
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 Rocket 750 provides a predictable performance profile in our mixed workload testing.
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