Configuring GAB manually


Configuring GAB manually
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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 configure GAB

Set up an /etc/gabtab configuration file on each node in the cluster using vi or another editor. The following example shows an /etc/gabtab file:
```
    /sbin/gabconfig -c -nN
```
Where the -c option configures the driver for use. The -nN option specifies that the cluster is not formed until at least N systems are ready to form the cluster. Veritas recommends that you set N to be the total number of systems in the cluster.

Warning:

Veritas does not recommend the use of the -c -x option or -x option for /sbin/gabconfig. Using -c -x or -x can lead to a split-brain condition.
Edit the following file on each node in the cluster to change the values of the GAB_START and the GAB_STOP environment variables to 1:

/etc/default/gab

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