Verifying LLT, GAB, and Cluster Operation

Before attempting to verify the operation of LLT, GAB, or the cluster, you must:

  Log in to any system in the cluster as root.

  Place the VCS command directory in your PATH variable:


# export PATH=$PATH:/usr/sbin:/sbin:/opt/VRTS/bin:/opt/VRTSvcs/bin

Verifying LLT

Use the lltstat command to verify that links are active for LLT. This command returns information about the links for LLT for the system on which it is typed. Refer to the lltstat(1M) manual page for more information.

Using lltstat -n

In the following example, lltstat -n is typed on each system in the cluster:

System 1

Output resembles:

System 2

Output resembles:

Note that each system has two links and that each system is in the OPEN state. The asterisk (*) denotes the system on which the command is typed.

Using lltstat -nvv

With LLT configured correctly, the output of lltstat -n shows all the systems in the cluster and two links for each system. If the output shows otherwise, you can use the verbose option of lltstat.

For example, type lltstat -nvv | more on a system to view additional information about LLT. In the following example, lltstat -nvv | more is typed on a system in a two-system cluster:

Output resembles:

Note that the output lists 32 nodes. It reports on the two cluster systems, north and south, plus non-existent nodes. For each correctly configured system, the information should show a state of OPEN, a status for each link of UP, and an address for each link. However, the output in the example shows that for the system south the private network connection is possibly broken or the information in the /etc/llttab file may be incorrect.

To obtain information about the ports open for LLT, type lltstat -p on any system. In the following example, lltstat -p is typed on one system in a two-system cluster:

System 1

Output resembles:

Verifying GAB

To verify that GAB is operating, type the following command on each system:

If GAB is operating, the following GAB port membership information is returned:

Port     a indicates that GAB is communicating, gen a36e0003 is a random generation number, and membership 01 indicates that systems 0 and 1 are connected.

Port h indicates that VCS is started, gen fd570002 is a random generation number, and membership 01 indicates that systems 0 and 1 are both running VCS.

If GAB is not operating, no GAB port membership information is returned:

If only one network is connected, the following GAB port membership information is returned:

For more information on GAB, refer to the VERITAS Cluster Server User's Guide.

Verifying the Cluster

To verify that the cluster is operating, type the following command:

The output resembles:

Note the system state. If the value is RUNNING, VCS is successfully installed and running. The group state lists the ClusterService group, which is ONLINE on north and OFFLINE on south. Refer to the hastatus(1M) manual page. In the VERITAS Cluster Server User's Guide, look for a description of system states and the transitions between them.

hasys -display

On one of the systems, use the hasys(1M) command:

On each system, the output should be similar. For more information on the hasys -display command, refer to the hasys(1M) manual page. Also refer to the VERITAS Cluster Server User's Guide for information about administering VCS from the command line.

The example shows the output when the hasys -display command is run on the system north; the list continues with similar information for south (not shown) and any other systems in the cluster: