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Samsung 950 Pro M.2 PCIe Gen 3x4 NVMe SSD RAID 0 Report

By: Jon Coulter | RAID in Storage | Posted: Feb 17, 2016 2:15 pm

Iometer – Maximum IOPS

 

Version and / or Patch Used: Iometer 2014

 

We use Iometer to measure high queue depth performance. (No Partition)

 

Max IOPS Read 8-Workers (FOB) QD 256 8GB LBA

 

samsung-950-pro-2-pcie-gen-3x4-nvme-ssd-raid-report_38

 

 

Max IOPS Write 8-Workers (FOB) QD 256 8GB LBA

 

samsung-950-pro-2-pcie-gen-3x4-nvme-ssd-raid-report_39

 

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We run this test at QD256, which is a queue depth that a consumer SSD will never see. We do this just to see what the maximum attainable IOPS from our configuration actually is. We notice that in the case of our dual 512GB 950 Pro array, the array is capable of pumping out nearly three times the performance of a single 512GB 950 Pro.

 

This is the effect of RST write-back caching and is a very good example of why you want to enable it. At enterprise queue depths, Intel's 750 delivers superior write performance. Now let's see what performance looks like at the opposite end of the spectrum, QD1, with our disk response testing.

 

 

Iometer – Disk Response

 

Version and / or Patch Used: Iometer 2014

 

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 runs twice for 30 seconds consecutively, with a 5-second ramp-up before each test. We partition the drive/array as a secondary device for this testing.

 

Avg. Write Response

 

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Avg. Read Response

 

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This is exactly what we saw from our synthetic testing. A single 950 Pro has better QD1 read performance than an array. This is common to all arrays we've tested over the years. Write response is another matter though (when write-back caching is enabled). A dual drive array delivers a 40% increase in QD1 write performance over a single 950 Pro.

 

This is significantly better performance and another benchmark we can point to as a reason why we believe a 950 Pro array is currently the best performing OS disk available.

 

 

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) composed primarily of incompressible sequential and random data as it's transferred from our DC P3700 PCIe NVME SSD to our test drive. We then read from a 6GB zip file that's part of our 28.6GB data block to determine the test drives read transfer rate. Our system is restarted prior to the read test to clear any cached data, ensuring an accurate test result.

 

Transfer Rates

 

samsung-950-pro-2-pcie-gen-3x4-nvme-ssd-raid-report_44

 

We only tested single drive performance because we aren't sure that we have anything fast enough to feed our arrays. In a single drive setting, Intel's 750 delivers the best transfer rates.

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