USB 3.0 passthrough DAS read/write performance

[tektotket]

ESXi 6.0

Drobo 5D 3.5.0 firmware

Lenovo 10E9000SUS or 10AY001RUS tiny pc's, i3 or i5 cpu, 8GB-16GB memory, flashed latest bios

using onboard usb 3.0 ports, add-in usb cards are not an option.

Read/write performance to Drobo ntfs volume is cut in half in Windows VM vs Windows physical installation, file copying reflects the test results.

Any suggestions to improve performance would be appreciated. 

xhci passthrough setup on vm -

local internal C: drive, Windows Server 2012 vm -

usb 3.0 Drobo ntfs, Windows Server 2012 vm -

usb 3.0 Drobo ntfs, Windows 7 physical installation -

[DavoudTeimouri]

Did you check the performance with other USB disks?

[tektotket · Accepted solution]

The problem is now resolved after updating host & vm vmware tools from 6.0 to 6.0u2 with same massive improvement confirmed on multiple systems -

usb 3.0 Drobo ntfs, Windows Server 2012 vm: