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Intel DC P3700 800GB NVMe vs. Intel 730 Series SATA SSD RAID Report

By: Jon Coulter | RAID in Storage | Posted: Jul 17, 2014 2:00 pm
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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.

 

Write Response

 

intel_dc_p3700_800gb_nvme_vs_intel_730_series_sata_ssd_raid_report_29

 

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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%.

 

Read Response

 

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Average Disk Response

 

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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: 2.6.2.0

 

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

 

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Read Transfer Rate

 

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intel_dc_p3700_800gb_nvme_vs_intel_730_series_sata_ssd_raid_report_35

 

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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