For this next set of tests, we measured access latency at various queue depths with the same fully random IOmeter 4K access pattern (67% reads, 33% writes), while each of the drives was also under a sustained sequential write workload. A sustained sequential write across the entire volume was initiated, and when performance plateaued, access latency was measured with IOMeter.
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Latency Under Load |
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Sustained Writes w/ 100% Random 4K Access Pattern |
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While under load, access latency increases across the board with all drives and all every queue depth. The SATA-based Samsung 883 DCT drives all performed similarly and, as expected, trailed the NVMe drives throughout. From QD1 - QD16, the Intel SSD DC P4510 offered better latency under load, but at the highest queue depth, the
Samsung 983 DCT pulled ahead, especially the higher-capacity 1.92TB model which offers increased write performance over its lower-capacity counterpart.
