Base Product Specifications
The five major measurements of base performance of any Solid State Storage solution are latency, random read/write and sequential read/write speed. These are the most common measurements posted by manufacturers to advertise storage performance. We will cover the latency and sequential read and write on this page and random performance on the following page. We begin with a measurement of the latency of the device. The industry standard for measurement of latency is 4K Random Access at a Queue Depth (QD) of one.
These tests consist of the drives in JBOD as separate LUNs. The listing of QD across the bottom axis is the aggregated QD of all devices in total. For example, each drive has a QD of 1 for the "5 QD" entry and a QD of 2 for the "10 QD" entry and so on so forth.
FOB results represent Fresh out of Box when the SSD is brand new. SS represents steady state, when the SSD has settled into its 'final' state of performance.
We also include our 20% over-provisioning results, indicated as "OP" in our graphs. OP consists of leaving 20% of the drive unformatted. By increasing the amount of available spare area, the SSD can perform at higher write speeds. This represents an optional boost for users at the cost of some capacity.
The latency of QD 5 represents 1 QD per SSD and .158 is a good showing. The latency scales up nicely as we head into the higher QD levels.
The 128K sequential read speeds reflect the maximum sequential throughput of the SSD using a realistic file size actually encountered in an enterprise scenario.
The P400E attained 2.2GB/s in FOB (Fresh out of Box) and 1.5GB/s in steady state.
The SSDs reach 1.294GB/s speed in 128K sequential writes. From the overprovisioned results, we can observe that it would be possible to maintain that level in steady state with a sacrifice of some capacity. The JBOD delivers 1GB/s in steady state.
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