RAID1 very slow with LSI card and 2x Samsung EVO 850 drives

performanceraidstorage

not sure if I'm checking it correctly, but here is what I have.

Desktop, LSI 9260-8i card, see config below. 2x 500Gb Samsung 850 EVO drives.
I also have Samsung 830 drive attached to motherboard directly (bootable with Win7)

So, I run HDTune Pro in Windows 7 to check drive performance. Old drive (system one) gets about 370mbps read speeds.

Virtual drive from controller get's about 120-130mbps. I expected it to be faster. Any ideas why it might be happening?

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Best Answer

The cache on the card is getting in the way. The raid card cache is designed to enhance the performance of spinning drives. The best option on most ssd array is direct io and write through. You can test the different performance using hdtune or various other tools. You can leave the drive cache enabled.

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