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WD Red Pro 4TB Enterprise NAS HDD Review

By: Paul Alcorn | HDDs in IT/Datacenter | Posted: Sep 30, 2014 10:16 pm
TweakTown Rating: 92%Manufacturer: WD

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.


We conduct our tests over the full LBA range to allow each HDD to highlight its average performance. All test samples feature 4TB of capacity, but the WD Red Pro and SE models feature a higher 7,200 RPM speed. The first page of results will provide the "key" to understanding and interpreting our test methodology.

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