For better performance always connect usb 30 and usb

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For better performance, always connect USB 3.0 and USB 2.0 devices to corresponding USB3.0 and USB 2.0 ports. A USB 3.0 or USB 2.0 port can be on any of the following components:
About USB Support in Oracle Solaris208Managing Devices in Oracle Solaris 11.3 • October 2015A USB PCI cardA USB hub that is connected to a USB portA SPARC or x86 computer motherboardNote - A USB 2.0 PCI card might be needed for older SPARC platforms.References for USB Information in Oracle SolarisThe following man pages provide information about USB versions:USB 3.0xhci(7D)USB 2.0ehci(7D); usba(7D)USB 1.1ohci(7D)The following man pages provide information about specific USB devices:Generic USBdriversugen(7D)Keyboard andmouse deviceshid(7D)Hubshubd(7D)Serial devicesusbser_edge(7D); usbsprl(7D); usbsksp(7D)Storage devicesscsa2usb(7D)Devicemanagementlibusb(3LIB)For information about specifications of different USB versions, go to home.USB Device Features and Compatibility IssuesTo identify the speed of your USB device, check the /var/adm/messagesfile for messagessimilar to the following:Dec 13 17:05:57 mysystem usba: [ID 912658 kern.info] USB 2.0 device(usb50d,249) operating at hi speed (USB 2.x) on USB 2.0 external hub:[email protected], scsa2usb0 at bus address 4
About USB Support in Oracle SolarisChapter 13 • Managing USB Devices209Except where indicated, Oracle Solaris supports USB devices on both SPARC and x86 basedsystems. Additional storage devices might work by modifying the scsa2usb.conffile. Formore information, see the scsa2usb(7D) man page.The following sections provide additional information about specific USB devices.Bus-Powered DevicesUSB hubs are not self-powered. They supply power to connected devices by deriving itfrom the USB bus to which they are connected. Consequently, and also because of powermanagement, power to these downstream devices is limited. Therefore, avoid overloading thesehubs. Note specifically the following limitations:You cannot cascade two bus-powered hubs.Each bus-powered hub is limited to a maximum of 100 mA only for each port.You can connect only self-powered or low bus-powered devices, not high bus-powereddevices, to a bus-powered hub.Some hubs or devices can report a false power source. With such hubs, the connectionmight be unpredictable.USB Keyboards and Mouse DevicesOn SPARC based systems, do not remove the keyboard and mouse during a system reboot orat the okprompt. During the boot process, the OpenBoot PROM (OBP) limits keyboard andmouse devices to the motherboard root hub ports only. You can move the keyboard and mouseto another hub at any time after a system reboot. These devices become fully functional afteryou plug them to their ports.On SPARC based systems, note the following issues with regards to these devices:The power key behaves differently between a USB keyboard and a type 5 keyboard. Ona USB keyboard, the SUSPEND/SHUTDOWN key suspends or shuts down the system.

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