IBM 8038 Installation And User Manual

Potential conflicts with the LAN over USB interfaceIn some situations, the IMM LAN over USB interface can conflict with certainnetwork configurations, applications, or both.For example, Open MPI attempts to use all of the available network interfaces on aserver. Open MPI detects the IMM LAN over USB interface and attempts to use itto communicate with other systems in a clustered environment. The LAN overUSB interface is an internal interface, so this interface does not work for externalcommunications with other systems in the cluster.Resolving conflicts with the IMM LAN over USB interfaceUse this information to resolve LAN over USB conflicts with networkconfigurations and applications.There are several actions that resolve LAN over USB conflicts with networkconfigurations and applications:1. For conflicts with Open MPI, configure the application so it does not attempt touse this interface.2. Take the interface down (run ifdown under Linux).3. Remove the driver (run rmmod under Linux).4. Disable the USB in-band interface on the IMM through either the IMM webinterface or the AMM web interface.Important: If you disable the USB in-band interface, you cannot perform anin-band update of the IMM firmware using the Linux or Windows flashutilities. If the USB in-band interface is disabled, use the Firmware Updateoption on the IMM web interface to update the firmware.If you disable the USB in-band interface, also disable the watchdog timeouts toprevent the server from restarting unexpectedly.v Use the following steps to disable the LAN over USB interface from the IMMweb interface.a. Log in to the IMM on which you want to disable the USB device driverinterface.b. In the navigation pane, click System Settings and scroll down to theMiscellaneous area.c. Select the Do not allow commands on USB interface check box todisable the USB in-band interface. Selecting this option does not affect theUSB remote presence functions (for example, keyboard, mouse, and massstorage). When you disable the USB in-band interface, the in-bandsystems-management applications such as the Advanced Settings Utility(ASU) and firmware update package utilities might not work.Note: The ASU works with a disabled USB in-band interface if an IPMIdevice driver is installed.If you try to use systems-management applications while the in-bandinterface is disabled, they might not work.d. Click Save.v Use the following steps to disable the LAN over USB interface from theAMM web interface:a. Log in to the AMM web interface.Chapter 4. Configuring the blade server 63