Red Hat GLOBAL FILE SYSTEM 4.7 Betriebsanweisung PDF herunterladen (Seite 115)

Setting the options lnet settings B–5

b. When you have identified an appropriate server for the test, enter the following command on

that server, to identify the NID of the server:

# lctl list_nids

34@elan

0xdd498cfe@gm

10.128.0.41@tcp

5. Enter the lctl ping command to verify connectivity, as shown in the following example, where

server_nid is the NID identified in Step 4. If the connection is successful, the command returns a

list of the NIDs of the available servers:

# lctl ping server_nid

The following is an example of testing connectivity over a Myrinet interconnect:

# lctl ping 0xdd498cfe@gm

12345-0@lo

12345-34@elan

12345-0xdd498cfe@gm

12345-10.128.0.41@tcp

• If there is a problem with connectivity, a message similar to the following is displayed.

failed to ping 10.128.0.41@tcp: Input/output error

If this happens, continue with the remaining steps in this procedure (the remaining steps are

needed to clean up the system after the test), and then examine your option lnet settings to

determine the cause of the problem.

• If the connection is successfully completed, continue with the remaining steps in this section.

These steps are needed to clean up the system after the test.

6. Unconfigure the lnet networks, by entering the following command:

# lctl net down

LNET ready to unload

7. Identify and then remove all of the Lustre modules that were loaded on the client node as a result of

your tests, as shown in the following example. In this example, the kgmlnd and lnet modules were

loaded for the test:

# rmmod libcfs

ERROR: Module libcfs is in use by kgmlnd,lnet

# rmmod kgmlnd lnet libcfs

If the test failed, there is a problem with the options lnet settings in the (/etc/modprobe.conf or

/etc/modules.conf) configuration file on the client node. Correct the settings and then perform the test

again.

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Red Hat GLOBAL FILE SYSTEM 4.7 Betriebsanweisung Seite 115