Test System and Methodology
Our approach to storage testing targets long-term performance with a high level of granularity. Many testing methods record peak and average measurements during the test period. These average values give a basic understanding of performance, but fall short in providing the clearest view possible of I/O QoS (Quality of Service).
While under load, all storage solutions deliver variable levels of performance. "Average" results do little to indicate performance variability experienced during actual deployment. The degree of variability is especially pertinent, as many applications can hang or lag as they wait for I/O requests to complete. While this fluctuation is normal, the degree of variability is what separates enterprise storage solutions from typical client-side hardware.
Providing ongoing measurements from our workloads with one-second reporting intervals illustrates product differentiation in relation to I/O QoS. Scatter charts give readers a basic understanding of I/O latency distribution without directly observing numerous graphs. This testing methodology illustrates performance variability, and includes average measurements during the measurement window.
IOPS data that ignores latency is useless. Consistent latency is the goal of every storage solution, and measurements such as Maximum Latency only illuminate the single longest I/O received during testing. This can be misleading, as a single "outlying I/O" can skew the view of an otherwise superb solution. Standard Deviation measurements consider latency distribution, but do not always effectively illustrate I/O distribution with enough granularity to provide a clear picture of system performance. We utilize high-granularity I/O latency charts to illuminate performance during our test runs, and our IOPS to Latency measurements highlight IOPS performance at specific latency points.
Our testing regimen follows SNIA principles to ensure consistent, repeatable testing, and utilizes multithreaded workloads found in typical production environments. The first page of results will provide the "key" to understanding and interpreting our test methodology.
We required the utmost performance to test the Serial Cables SA-ENC12G-024A 24-port Direct Attach JBOD, and the HGST SSD800MH provides the best result in steady state of the available 12Gb/s SSDs. The HGST SSD800MH SSDs feature sequential read/write speeds of 1200/750 MB/s, and read/write IOPS of 145,000/100,000 IOPS.
We paired the HGST SSDs with the Adaptec ASR-8885 12Gb/s RAID controller, and we conducted our tests at the default controller settings. In our testing, we are searching for any performance variation between two arrays; one array is directly attached via cabling to the RAID controller, and the other array is connected via the Serial Cables enclosure.
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- Page 1 [Introduction]
- Page 2 [SA-ENC12G-024A Internals and Specifications]
- Page 3 [Test System and Methodology]
- Page 4 [Benchmarks - 4k Random Read/Write]
- Page 5 [Benchmarks - 8k Random Read/Write]
- Page 6 [Benchmarks - 128k Sequential Read/Write]
- Page 7 [Benchmarks - Database/OLTP and Web Server]
- Page 8 [Benchmarks - Email Server]
- Page 9 [Final Thoughts]
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