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Configuring GAB when adding a node to a single node cluster
VCS uses the Group Membership Services/Atomic Broadcast (GAB) protocol for
cluster membership and reliable cluster communications. GAB has two major
functions.
It handles the following tasks:
■ Cluster membership
■ Cluster communications
To configureGAB, use vi or another editor to set up an /etc/gabtabconfiguration
file oneach node in the cluster. The following exampleshows an /etc/gabtab file:
/sbin/gabconfig -c -nN
The -c option configures the driver for use. The -nN specifies that the cluster is
not formed until at least N systems are ready to form the cluster. By default, N is
the number of systems in the cluster.
Note: Symantec does not recommend the use of the -c -x option for
/sbin/gabconfig. Using-c -x dramaticallyincreases configuration time for the
Gigabit Ethernet controller and can lead to a split-brain condition.
Starting LLT and GAB
On the new node, start LLT and GAB.
To start LLT and GAB
1
Start LLT on Node B.
# /etc/init.d/llt start
2
Start GAB on Node B.
# /etc/init.d/gab start
Reconfiguring VCS on the existing node
Reconfigure VCS on the existing nodes.
149Installing VCS on a single node
Adding a node to a single-node cluster