In my latest post USB Devices as VMFS Datastore in vSphere ESXi 6.0 I had a problem with USB 3.0 devices that are detected as USB 2 in ESXi. I know that USB 3.0, also known as eXtensible Host Controller Interface (xHCI), is supported in ESXi 6.0 and ESXi 5.5 Build 2143827 or later. Unfortunately all of my devices are detected as USB 2.1, despite the USB 3 hub was visible. This problem applies to both, USB devices in path-through mode, and USB devices mounted from the command line with usbarbitrator disabled. The solution was quite simple and not related to an ESXi, but to a UEFI configuration.



Within the UEFI the xHCI mode is configurable with a default of "Smart Auto". According to the documentation, in "Smart Auto" mode the USB 3.0 port acts like a 2.0 port before OS USB 3.0 drivers are loaded. For whatever reason, this does not work properly with ESXi. After setting xHCI Mode to "Enabled", all devices are correctly identified as USB 3.0.

During my tests I've use two USB 3.0 capable devices on my 5th Gen Intel NUC (NUC5i5MYHE):

External 1TB 2.5" HDD (Seagate RSS LLC FreeAgent GoFlex USB 3.0)

USB 3.0 to mSATA SSD Enclosure (ASMedia Technology Inc.)

ESXi 6.0 with xHCI Mode "Smart Auto"

Both devices are connected to "Bus 001", which is the 2.0 root hub:

~ # vmware -v VMware ESXi 6.0.0 build-3073146 ~ # lsusb Bus 001 Device 007: ID 0bc2:5031 Seagate RSS LLC FreeAgent GoFlex USB 3.0 Bus 001 Device 006: ID 174c:1153 ASMedia Technology Inc. Bus 001 Device 003: ID 0930:6545 Toshiba Corp. Kingston DataTraveler 102 Flash Drive / HEMA Flash Drive 2 GB / PNY Attache 4GB Stick Bus 001 Device 002: ID 8087:8001 Intel Corp. Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

ESXi 5.5 with xHCI Mode "Smart Auto"

Same problem here. Both devices on "Bus 001".

~ # vmware -v VMware ESXi 5.5.0 build-3116895 ~ # lsusb Bus 001 Device 008: ID 0bc2:5031 Seagate RSS LLC FreeAgent GoFlex USB 3.0 Bus 001 Device 007: ID 174c:1153 ASMedia Technology Inc. Bus 001 Device 003: ID 0930:6545 Toshiba Corp. Kingston DataTraveler 102 Flash Drive / HEMA Flash Drive 2 GB / PNY Attache 4GB Stick Bus 001 Device 002: ID 8087:8001 Intel Corp. Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

You can also use the lsusb -v command to see a verbose output containing the USB version (2.10):

~ # lsusb -v Bus 001 Device 008: ID 0bc2:5031 Seagate RSS LLC FreeAgent GoFlex USB 3.0 Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.10 bDeviceClass 0 (Defined at Interface level) [...] Bus 001 Device 007: ID 174c:1153 ASMedia Technology Inc. Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.10 [...]

The problem described here applies only if you see a USB 3.0 root hub but devices are connected to the wrong hub. If you do not see the USB 3.0 hub you have to verify that the xhci module is enabled and loaded with:

~ # esxcli system module list |grep xhci Name Is Loaded Is Enabled xhci true true

To enable it (Load it automatically on boot):

~ # esxcli system module set -e true -m xhci

To load it while ESXi is running:

~ # vmkload_mod xhci

xHCI Mode "Enabled"

After setting the xHCI Mode to "Enabled" in the UEFI, both devices are connected to the USB 3.0 hub:

~ # vmware -v VMware ESXi 5.5.0 build-3116895 ~ # lsusb Bus 002 Device 002: ID 174c:1153 ASMedia Technology Inc. Bus 002 Device 004: ID 0bc2:5031 Seagate RSS LLC FreeAgent GoFlex USB 3.0 Bus 001 Device 002: ID 0930:6545 Toshiba Corp. Kingston DataTraveler 102 Flash Drive / HEMA Flash Drive 2 GB / P Attache 4GB Stick Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

~ # vmware -v VMware ESXi 6.0.0 build-3073146 ~ # lsusb Bus 002 Device 002: ID 174c:1153 ASMedia Technology Inc. Bus 002 Device 004: ID 0bc2:5031 Seagate RSS LLC FreeAgent GoFlex USB 3.0 Bus 001 Device 002: ID 0930:6545 Toshiba Corp. Kingston DataTraveler 102 Flash Drive / HEMA Flash Drive 2 GB / PNY Attache 4GB Stick Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub lsusb -v Bus 002 Device 003: ID 174c:1153 ASMedia Technology Inc. Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 3.00 [...]