Test System and Methodology
We utilize a new approach to HDD and SSD storage testing for our Enterprise Test Bench, designed specifically to target 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).
'Average' results do little to indicate the 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. This testing methodology illustrates performance variability, and includes average measurements, during the measurement window.
While under load, all storage solutions deliver variable levels of performance. 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.
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 use histograms to illuminate the latency of every single I/O issued during our test runs.
Our testing regimen follows SNIA principles to ensure consistent, repeatable testing. We attain steady state through a process that brings the device within a performance level that does not range more than 20% during the measurement window. Forcing the device to perform a read-write-modify procedure for new I/O triggers all garbage collection and housekeeping algorithms, highlighting the real performance of the solution.
We measure power consumption during precondition runs. This provides measurements in time-based fashion, with results every second, to illuminate the behavior of power consumption in steady state conditions. Power consumption can cost more over the life of the device than the initial acquisition price of the hardware itself. This significantly affects the TCO of the storage solution. We also present IOPS-to-Watts measurements to highlight the efficiency of the storage solution.
For LSI SandForce-powered SSD's we conduct all preconditioning, and the following workloads, with 50% compressible data. This is the result of industry feedback, and the middle ground provides a picture of performance that is neither too critical, nor too favorable. Readers must bear in mind that there is varying performance with LSI SandForce processors due to its internal compression engine. Incompressible data will score much lower than the results presented in these tests, and fully compressible data will score much higher. It is important for administrators to know their workload and select the storage solution accordingly.
Our test pool features SSD's of varying capacity, so it is important to bear this in mind when viewing results. The first page of results will provide the 'key' to understanding and interpreting our new test methodology.
PRICING: You can find products similar to this one for sale below.
United States: Find other tech and computer products like this over at Amazon's website.
United Kingdom: Find other tech and computer products like this over at Amazon UK's website.
Canada: Find other tech and computer products like this over at Amazon Canada's website.
- We at TweakTown openly invite the companies who provide us with review samples / who are mentioned or discussed to express their opinion of our content. If any company representative wishes to respond, we will publish the response here.
Recommended for You
Latest News Posts
- Law student caught trying to hack and change his marks for the better
- Black Friday, $500 off Eurocom laptop with Desktop i7 CPU and GTX 980
- ESPN subscribers diminish at an alarming rate, streaming is to blame
- Someone has hacked Street Fighter 5 Beta for the PC
- Hearthstone World Championships 2016 prize pool raised to $1 million
- ID-Cooling Frostflow 240L CPU Liquid Cooler Review
- Lexar JumpDrive M20i 32GB OTG iOS Flash Drive Review
- Gibabyte GA-Z170X- Gaming 7 Supported RAM (2 x16Gb or 4 x 8GB) ?
- heya! PC-A10 case parts?
- Enermax ETS-T40fit CPU Coolers Review
- Team Group Announces Neptune Gaming SO-DIMM Memory
- Cooltek Announces the Skall Series ATX Mid-tower Chassis
- Eurocom offers $500 USD off Black Friday & Cyber Monday deal for EUROCOM Sky X9 Desktop Laptop with Intel Skylake desktop class CPUs and NVIDIA GeForce GTX 980 Desktop GPU and 64 GB DDR4 memory
- MSI @ DREAMHACK WINTER 2015
- ADATA Releases the Lightning Card Reader