Tech content trusted by users in North America and around the world
6,795 Reviews & Articles | 46,939 News Posts
Make us an awesome TweakTown wallpaper, win a Corsair Hydro H110i GT

Western Digital WD Se Enterprise HDD Review - Test System and Methodology

By: Paul Alcorn | HDDs in IT/Datacenter | Posted: Jul 11, 2013 5:03 am
TweakTown Rating: 92%Manufacturer: WD

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.


We measure power consumption during test 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.


Our test pool features HDDs of varying capacity, so it is important to bear this in mind when viewing results. We conduct our tests over the full LBA range to allow each HDD to highlight its top performance. In some cases, this approach can give slower speed, and higher capacity, HDDs a slight advantage in test results due to a longer 'dwell' time on outer tracks. Typically, this is not a concern when testing HDDs of similar speeds and capacities. 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.

Related Tags

Got an opinion on this content? Post a comment below!
Subscribe to our Newsletter

Latest News Posts

View More News Posts

Forum Activity

View More Forum Posts

Press Releases

View More Press Releases