128K Sequential Write/Read
We precondition the drive for 6,500 seconds, or 1.8 hours, receiving performance data every second. A sequential steady state is achievable in a much shorter span of time than a random steady state. We plot both MB/s and Latency. We plot MB/s using blue scatter and Latency using orange scatter. We observe that the DC P3608 achieves steady state at 0 seconds of preconditioning, indicating that the previous 2x LBA fill phase achieved a sequential steady state.
Sequential write performance of the DC P3608 in RAID mode comes in slightly below the up to 2000 MB/s specification given by Intel. The peak for us was 1,970 MB/s at QD16. From QD16 - 256, the DC P3608 follows a slight downward trend ending up at 1,863 MB/s at QD256. As a single non-aggregated 800GB volume, the drive follows a less pronounced downward trend as QD increases. The opposite is true for the XS1715. It follows a more conventional trend, peaking at 1400 MB/s at QD256.
When we first saw the specifications given for the DC P3608, two figures given immediately grabbed our attention. First, the drive's random 4K read IOPS of 850K, the other, its sequential read speed of 5GB/s. The 850K random 4K read spec has proven to be spot on, and as you can see, the drive's 5GB/s sequential read specification is as well.
At QD128, the DC P3608 is 75% faster than Samsung's venerable XS1715. As we pointed out earlier, striping makes a big difference in a RAID volume. Intel's RSTe for NVMe driver and control panel gives us the ability to customize stripe sizes. The reason I point this out again is because we chose 128 KB stripes for our volume. 128 KB is the largest stripe size, and it is well suited to deliver the best sequential speed, although, typically at the sacrifice of some random performance. In RAID 0 mode, with 128 KB stripes, the DC P3608 is delivering OVER DOUBLE the sequential read performance of a single non-aggregated 800GB volume.
Conclusion: At this point, it's clear that the DC P3608 in RAID 0 mode is much faster than the competition.
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