Verifying LLT

Use the lltstat command to verify that links are active for LLT. If LLT is configured correctly, this command shows all the nodes in the cluster. The command also returns information about the links for LLT for the node on which you typed the command.

Refer to the lltstat(1M) manual page for more information.

To verify LLT

  1. Log in as superuser on the node galaxy.

  2. Run the lltstat command on the node galaxy to view the status of LLT.

    lltstat -n

    The output on galaxy resembles:

        LLT node information:
            Node             State           Links
            *0 galaxy          OPEN           2
             1 nebula          OPEN           2

    Each node has two links and each node is in the OPEN state. The asterisk (*) denotes the node on which you typed the command.

  3. Log in as superuser on the node nebula.

  4. Run the lltstat command on the node nebula to view the status of LLT.

    lltstat -n

    The output on nebula resembles:

        LLT node information:
            Node             State           Links
             0 galaxy          OPEN           2
            *1 nebula          OPEN           2
  5. To view additional information about LLT, run the lltstat -nvv command on each node.

    For example, run the following command on the node galaxy in a two-node cluster:

    lltstat -nvv | more

    The output on galaxy resembles:

        Node          State      Link    Status      Address
        *0 galaxy      OPEN
                                 lan1 UP     08:00:20:93:0E:34
                                 lan2 UP     08:00:20:93:0E:34
        1 nebula       OPEN
                                 lan1 UP     08:00:20:8F:D1:F2
                                 lan2 DOWN                             
        2             CONNWAIT
                                 lan1 DOWN
                                 lan2 DOWN
        3             CONNWAIT
                                 lan1 DOWN
                                 lan2 DOWN
        .
        .
        .
    
        31            CONNWAIT
                                 lan1 DOWN
                                 /dev/lan:2 DOWN

    Note that the output lists 32 nodes. The command reports the status on the two nodes in the cluster, galaxy and nebula, along with the details for the non-existent nodes.

    For each correctly configured node, the information must show the following:

    • A state of OPEN

    • A status for each link of UP

    • An address for each link

    However, the output in the example shows different details for the node nebula. The private network connection is possibly broken or the information in the /etc/llttab file may be incorrect.

  6. To obtain information about the ports open for LLT, type lltstat -p on any node.

    For example, type lltstat -p on the node galaxy in a two-node cluster:

    lltstat -p

    The output resembles:

        LLT port information:
          Port  Usage       Cookie
          0     gab          0x0
                opens:       0 2 3 4 5 6 7 8 9 10 11 ... 28 29 30 31
                connects:    0 1 
          7     gab          0x7
                opens:       0 2 3 4 5 6 7 8 9 10 11 ... 28 29 30 31
                connects:    0 1 
          31    gab          0x1F
                opens:       0 2 3 4 5 6 7 8 9 10 11 ... 28 29 30 31
                connects:    0 1