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SanDisk Extreme Pro 240GB Six-Drive SSD RAID Report

By: Jon Coulter | RAID in Storage | Posted: Nov 28, 2014 11:20 pm

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.

 

Write Response

 

sandisk_extreme_pro_240gb_six_drive_ssd_raid_report_27

 

Read Response

 

sandisk_extreme_pro_240gb_six_drive_ssd_raid_report_28

 

Average Disk Response

 

sandisk_extreme_pro_240gb_six_drive_ssd_raid_report_29

 

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: 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 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

 

sandisk_extreme_pro_240gb_six_drive_ssd_raid_report_30

 

Read Transfer Rate

 

sandisk_extreme_pro_240gb_six_drive_ssd_raid_report_31

 

sandisk_extreme_pro_240gb_six_drive_ssd_raid_report_32

 

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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