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SanDisk Optimus Eco SSD RAID Enterprise Performance Analysis

By: Paul Alcorn | RAID/HBA in IT/Datacenter | Posted: Oct 17, 2014 2:03 pm

4k Random Read/Write




We precondition the SanDisk Optimus ECO arrays 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 gives 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.


The eight-drive RAID 0 array starts with spectacular performance of 504,753 IOPS at 256 OIO (Outstanding I/O). The eight-drive RAID 10 also provides impressive random read performance of 331,416 IOPS, trailed by the four-drive RAID 0 and 10, which hover at a tremendous 331,000 IOPS.






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 arrays that are lowest and furthest to the right exhibit the most desirable latency characteristics.


The SSD arrays provide excellent low-latency performance, and the eight-drive RAID 0 exhibits a decrease in overall latency as we stack on more drives. All arrays manage to stay well under 1ms while delivering amazing IOPS performance. This excellent latency-to-IOPS ratio provides a huge benefit in application performance, especially in VDI and other high-performance applications.




The eight-drive RAID 0 configuration cuts through the heavy write workload with ease, churning out a beastly 225,703 IOPS. The eight-drive RAID 10 and four-drive RAID 0 provide 115,000 IOPS at 256 OIO, and the four-drive RAID 10 provides 58,146 IOPS.






The proof is in the latency pudding when it comes to overall performance. IOPS scaling is important, but latency is far more important to application performance. The eight-drive RAID 0 array provides superb latency characteristics, and delivers the bulk of its performance well below the 1ms waterline.




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.


Mixed workload testing reveals tremendous scaling in the common middle-ranges experienced during deployment. In VDI and other intensive applications, mixed I/O is a constant reality, resulting in the I/O blender effect. The SanDisk Optimus Eco delivers excellent scaling in mixed random testing. This clear scaling across all mixed workloads allows users to select and scale the correct number of drives to address performance challenges with confidence.

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