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Slow software raid

Z3R0C00L
By Z3R0C00L
in Troubleshooting
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Good day all!

First of all, here is my current configuration:
CPU: FX-8350 (not overclocked)
Mobo: MSI 970A-G46 

Ram: 8GB 1866MHz DDR3

OS Drive: Samsung 940 EVO 250GB connected through a cheap PCI-E sata controller
Storage Drives: 6x 2TB Seagate baracuda connected to the Sata III ports on the motherboard

OS: Windows Server 2012 R2 Essential

 

Here is my problem. Regardless of the software raid type i choose, i always have a slow write speed issue.
Right now it set up in Raid 0+5 (3x 2hdd in raid 0 via the mobo raid and the 3 array in raid 5 in windows)

 

I get an average of 300MBps read and a shy 30MBps write.

I tried a simple raid 5 and also a raid 10 and still get the same results.
 

The raid and sata drivers are up-to-date as well as windows.

The write caching is enabled.

 

I know that onboard raid is not the best but i cant understand the huge difference between the reads and writes.

 

Next thing i want to try is install Ubuntu server and create a ZFS Raidz array to see if it would improve speeds.

 

Thanks for all you help

Main: Intel i7-4770K, MSI Z87 MPower, 2x 4GB G.Skills 1866MHz CL9, 2x Gigabyte R9-290X, Fractal Design XL R2, 2x Samsung EVO 250GB Raid0 and 2x 1TB Seagate Raid0, Top power 1000W 80+ Bronze, Asus PCE-AC68

Server: AMD FX-8350, MSI 970a-G46, 2x 4GB Mushkin 1866Mhz CL9, MSI 8600GT, Fractal Design Define R4, Samsung EVO 250GB and 6X 2TB Seagate RAID 10, EVGA 850W Supernova G2 80+Gold, 2x Intel GBe NIC
Router: Pfsense 2.2, Intel Core 2 Quad Q6600, Acer crap motherboard, 4x 2GB Samsung 800Mhz CL4, Fractal Design Node 604, OCZ Agility 2 50GB, Thermaltake 400W 80+, 2x Intel GBe NIC

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