RAID-5 read speed is very slow

[Burak_K]

I have windows 11 pro for workstation and use 2 RAID-5 volumes for storage (nvme group and ssd group). The read speed for the nvme group is around 2220 MB/s and the write speed is around 170 MB/s. SSD group counts as the same.

I tried 128kb, 64kb, 32kb and 16kb for stripe size, but the speed drops as the stripe size gets smaller.

I also tried hardware and software raid-5. Software raid-5 was slower.

Here are the data i have:

Strip size:64kb hardware raid-5 for nvme:

Strip size:128kb hardware raid-5 for ssd:

Non-raid ssd:

Strip size:128kb,32kb and 16kb hardware raid-5 for nvme:

I forgot to take a picture in my tests for this, but 16kb strip size had dropped to double digits.

Strip size:64kb,32kb and 16kb hardware raid-5 for ssd:

I forgot to take a picture in my tests for this, but 16kb strip size had dropped to single digits.

Strip size:128kb software raid-5 for ssd:

System information:

Intel® Core™ i9-13900K Processor 36M Cache, up to 5.80 GHz -> https://www.intel.com/content/www/us/en/products/sku/230496/intel-core-i913900k-processor-36m-cache-up-to-5-80-ghz/specifications.html

MSI MAG Z790 Tomahawk WiFi -> https://www.msi.com/Motherboard/MAG-Z790-TOMAHAWK-WIFI/Specification

4 x SNV2S/500G (Nvme)-> https://www.kingston.com/en/ssd/nv2-nvme-pcie-ssd

ST2000NM0011 (SSD)

ST2000DM008-2UB102 (SSD)

TOSHIBA HDWD320 (SSD)

Configurations:

Driver Version:

All drivers updated latest version from msi. 

[Jocelyn_Intel]

Hello, @Burak_K  

Thank you for posting on the Intel® communities.  

I am sorry to hear what is happening with your RAID 5. 

We tried to replicate your issue in a RAID 5 with the latest Intel® RST version, however, our results were the expected and great hence this issue might be related to the Motherboard or the drives. 

Best regards,  

Jocelyn M.   

Intel Customer Support Technician.