Unusually fast disk performance ESXI 7.0.1

[Pollard]

Setting up a ESXI 7.0.1 server for a customer and I just noticed a unusually fast read/write performance for some western digital purple drives in RAID 5. Also test the SSD's and there reading in GB/s something just seems off. 😯. Any ideas on whats going on?

SPECS

PERC H740P / RAID 5 4x WD82PURZ 8TB

RAID 1 2x 480GB DELL SSD 400-AXRJ

DELL R7515

ESXI 7.0.1

1GB TEST WD82PURZ

32GB TEST WD82PURZ

SSD's  

 

 

[continuum]

You used ATTO Disk Benchmark ?

We recently used that tool too and also got obscure results.
Then we repeated the tests with a different version of that tool and other products and received reasonable results.

We came to the conclusion that the version we used for the first tests was the real problem.

Suggestion: repeat benchmarks using other tools

[a_p_]

In addition to what @continuum said, remember that the RAID controller - unless I'm mistaken - has 8GB cache, which may also affect the results

André

[Pollard]

Yeah I started doing to some reading It's reporting the raid controller speed.