Iometer - Disk Response
Version and / or Patch Used: 1.1.0
We use Iometer to measure disk response times. Disk response times are measured at an industry accepted standard of 4k QD1 for both write and read. Each test is run twice for 30 seconds consecutively, with a 5 second ramp-up before each test. The drive/array is partitioned and attached as a secondary device for this testing.
One of the many advantages of the NVMe protocol is that it is able to utilize less CPU cycles to deliver the same performance as SATA Based RAID arrays. Our array is delivering 1.83x the write IOPS of the DC P3700, but it is doing so at a CPU utilization of 22.23%. The DC P3700 is delivering its performance at a CPU utilization of just 7.52%.
Average Disk Response
Write response times benefit most from RAID 0 because of write caching. There is a slight latency increase in read response times for an array vs. a single drive. The DC P3700 has better read response than our SATA arrays. Our arrays have better write response.
DiskBench - Directory Copy
Version and / or Patch Used: 188.8.131.52
We use DiskBench to time a 28.6GB block (9,882 files in 1,247 folders) of mostly incompressible random data as it's transferred from our OS array: to our test drive/array. We then read from a 6GB zip file that's part of our 28.6GB data block to determine the test drive/array's read transfer rate. The system is restarted prior to the read test to clear any cached data, ensuring an accurate test result.
Write Transfer Rate
Read Transfer Rate
We are only charting transfer up to a three drive array for the simple reason we don't have anything fast enough to feed an array of more than three drives. We are transferring data from a 3-drive array to a 3-drive array. Read transfers scale very well, but write transfers are handicapped by SATA architecture's single lane signaling.
To test the DC P3700, we created a secondary partition to transfer data from and to itself. Read performance with an actual data transfer is lightning quick. Write transfer performance is faster than a 3-drive array, but not a whole lot faster. I have a 3-drive array on the bench now that can beat the write transfer capabilities of the DC P3700. There is nothing sequential about the data we are transferring, so the speeds we are getting are entirely expected.
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- Page 1 [Introduction]
- Page 2 [Specifications, Test System Setup, Drive Properties, Pricing and Availability]
- Page 3 [Synthetic Benchmarks - ATTO, Anvil Storage Utilities, CrystalDiskMark & AS SSD]
- Page 4 [Benchmarks (Trace Based OS Volume) - PCMark Vantage, PCMark 7 & PCMark 8]
- Page 5 [Benchmarks (Secondary Volume) - Disk Response & Transfer Rates]
- Page 6 [Benchmarks (Secondary Volume) - PCMark 8 Extended]
- Page 7 [Final Thoughts]
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