Need clarification on writing on NVMe SSDs with maximum speed possible.

[ChaithraMahadeva]

Hi,

I'm trying to write a binary file to NVMe SSD with highest speed possible. According to CrystalDiskMark results, a RAID0 Disk (8 NVMe SSDs) with 16TB capacity can give 16.5GB/s writing speed.
Then, I checked the CrystalDiskMark source code as a reference to improve write performance. I created a small trial project with CreateFile and WriteFile functions from C++ standard library to write 4MB of data 16 times sequentially and the speed I observed was just 150MB/s. On the contrary, writing 4MB of data 16 times using ofstream::write gave speed upto 4.5GB/s.

I'm now confused from my observations, whether I have interpreted your code to write faster is wrong or missed something important while using it. Kindly advice me with a small piece of example code (preferably in C++) to achieve maximum write speed in NVMe SSDs/RAID0 disks.

Thank you for your time.

Best regards,
Chaithra