- Configure LNet for a server

# Configure LNet for a server

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LNet provides the client network infrastructure required by the Lustre file system. It supports many commonly-used network types such as InfiniBand and Ethernet.

Note: LNet configuration occurs automatically during the process of adding a server (see Adding one or more servers). The steps described in this section allow you to change LNet configuration parameters for a server.

You can change the LNet configuration using the Intel® Manager for Lustre* GUI. We can set the NIDs for each server port that we want to connect to LNet. Using the GUI, you can configure NIDs for each OSS, MGS and MDS server, and if you're configuring hierarchical storage management, for each HSM Agent node and Robinhood policy engine server as well.

Note: If you use the Intel® Manager for Lustre* GUI to configure LNet, the file system must exist on a single LNet, and all servers and clients must be on this LNet. In this case, all configuration information is saved in a reserved file called /etc/modprobe.d/iml_lnet_module_parameters.conf. (Do not manually edit this file.) However, if you wish to configure more advanced features, such as routes and IP networks, then you should do this manually, in a separate file contained in the /etc/modprobe.d directory. For more information, see the Lustre Operations Manual, Chapter 9 - Configuring Lustre Networking: http://build.whamcloud.com/job/lustre-manual/lastSuccessfulBuild/artifact/lustre_manual.xhtml#configuringlnet.

To configure LNet NIDs for a server port:

1. | At the menu bar, click the Configuration drop-down menu and click Servers.

2. | To set the NID for a network interface on a given server, the LNet State for that server must indicate LNet up. If LNet is not up, click Actions and select Start LNet.

3. | When LNet has started, the LNet State will indicate LNet up, and the Configure button becomes active. Click Configure.

4. | The NID Configuration for <server name> dialogue appears. This window applies to this server only. Available network interfaces appear on the left, with their associated IP addresses. Click the LNet button for the desired interface to select the Lustre Network number you want to assign to this interface. Do this for each interface you want to configure with an LNet NID.

5. | Click Save. Click Close to close this dialogue.

6. | Repeat this process for each server in your file system.