I have two servers, each with WD Red 2.5 1tb hard drives. The servers run 4 drives in RAID 10 configuration.

I had previously benchmarked them with ATTO’s Disk Benchmark software on two different occasions. I thought it was strange to get different results. Today I was doing another benchmark and again got a 3rd set of results.

Here are the dates and different results I have received.

August 29, 2014

Maximum Read: 162MB/Sec
Maximum Write: 135MB/Sec

April 7, 2015

Maximum Read: 174MB/Sec
Maximum Write: 58MB/Sec

September 5, 2015

Maximum Read: 143MB/Sec
Maximum Write: 70MB/Sec

Why so much variance in the results? Really strange…

I suspect the results from April 7, 2015 are probably ‘off’ as the write speed sorta flat lining around 55MB/Sec seems too consistent.

If you just go with the average (maximums) from the other two you get:

Maximum Read: 152MB/Sec
Maximum Write: 102MB/Sec