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VCS uses two components LLT and GAB to share data over private networks among systems. These components provide the performance and reliability required by VCS.
LLT(Low Latency Transport) provides fast, kernel-to-kernel communications,and monitors network connections. The system administrator configures LLT by creating the configuration files /etc/llthosts, which lists all the system in the cluster, and /etc/llttab, which descrbes the local system’s private network links to the other system in the cluster.
GAB(group membership and atomic broadcast) provides the global message order required to maintain a synchronized state among the systems and monitors disk communications such as that required by the VCS heartbeat utility.The system administrator configures GAB driver by creating a configuration file(/etc/gabtab)
Verifying LLT and GAB configuration files
The following files are required by the VCS communication services LLT and GAB.
/etc/llthosts
The file llthosts is a database containing one entry per system that links the LLT system ID (in the first column) with the LLT host name This file is identical on each system in the cluster.
For example the file /etc/llthosts contains entries that resemble:
0 north
1 south
/etc/llttab
The file llttab contains information that is derived during installation and used by the utility lltconfig . After installation ,this file lists the private network links that correspond to the specific system.
For example the file /etc/llttab contains entries that resemble:
Set-node north
Set-cluster 2
Link qfe:0 /dev/qfe:0 – ether - -
Link qfe:1 /dev/qfe:1 – ether - -
The first line identifies the system. The second line identifies the cluster---the cluster ID you entered during installation. The next two lines beginning with the link command, identify the two network cards used by the LLT protocol.
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