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Configuring LLT and GAB

Create the LLT and GAB configuration files on the new node and update the files on the existing nodes.

 To configure LLT

1. Create the file /etc/llthosts on the new node. You must also update it on each of the current nodes in the cluster.

   For example, suppose you are adding east to a cluster consisting of north and south:

   • If the file on one of the existing nodes resembles:

     0 north

     1 south

   • Update the file for all nodes, including the new one, resembling:

     0 north

     1 south

     2 east

2. Create the file /etc/llttab on the new node, making sure that line beginning "set-node" specifies the new node.

   The file /etc/llttab on an existing node can serve as a guide.

   See /etc/llttab.

   The following example describes a system where node east is the new node on cluster number 2:

   set-node east

   set-cluster 2

   link lan1 /dev/lan1 - ether - -

   link lan2 /dev/lan2 - ether - -

3. On the new system, run the command:

   # /sbin/lltconfig -c

 To configure GAB

1. Create the file /etc/gabtab on the new system.
   • If the /etc/gabtab file on the existing nodes resembles:

     /sbin/gabconfig -c

     then the file on the new node should be the same, although it is recommended to use the -c -nN option, where N is the number of cluster nodes.

   • If the /etc/gabtab file on the existing nodes resembles:

     /sbin/gabconfig -c -n2

     then, the file on all nodes, including the new node, should change to reflect the change in the number of cluster nodes. For example, the new file on each node should resemble:

     /sbin/gabconfig -c -n3

     See /etc/gabtab.

     The -n flag indicates to VCS the number of nodes required to be ready to form a cluster before VCS starts.

2. On the new node, run the command, to configure GAB:

   # /sbin/gabconfig -c

 To verify GAB

1. On the new node, run the command:

   # /sbin/gabconfig -a

   The output should indicate that Port a membership shows all nodes including the new node. The output should resemble:

   GAB Port Memberships

   ====================================

   Port a gen a3640003 membership 012

   See Verifying GAB.

2. Run the same command on the other nodes (north and south) to verify that the Port a membership includes the new node:

   # /sbin/gabconfig -a

   GAB Port Memberships

   ====================================

   Port a gen a3640003 membership 012

   Port h gen fd570002 membership 01

   Port h gen fd570002 visible ; 2