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 five-second ramp-up before each test. The drive/array is partitioned and attached as a secondary device for this testing.
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.
DiskBench - Directory Copy
Version and / or Patch Used: 220.127.116.11
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 Intel P3700 PCIe SSD 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
Now that we have an Intel P3700 at our disposal, we can chart up to a six-drive array's transfer rates. We are still limited by single lane signaling of the SATA interface though. Furthermore, the data we are transferring is not sequential in nature. The 580 MB/s write transfer rate is getting close to the limits of what our SATA interface will allow, as evidenced by the fact that we can hit this transfer rate with a three-drive array. Read transfers are a different matter though, and we see a nice increase in rates up to a five-drive array.
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- Page 1 [Introduction]
- Page 2 [Specifications, Drive Details, 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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