VCS Q & A PAGE - 1

              VCS INTERVIEW QUESTIONS AND ANSWERS
                                         
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1..What you mean by  VCS?

Veritas Cluster Server also known as VCS is a High-availability cluster software, for Unix, Linux and Microsoft Windows computer systems, created by Veritas Software (now part of Symantec). It provides application cluster capabilities to systems running other applications, including databases, network file sharing, and electronic commerce websites.

2..What are LLT and GAB?

VCS uses two components, LLT and GAB, to share data over private networks

among systems. These components provide the performance and reliability that

VCS requires.

LLT (Low Latency Transport) provides fast, kernel-to-kernel communications,

and monitors network connections.

GAB (Group Membership and Atomic Broadcast) provides the global message

order that is required to maintain a synchronized state among the nodes. It

monitors disk communications such as the VCS heartbeat utility

3..What is the use of VCS Simulator?

VCS Simulator enables you to simulate and test cluster configurations. Use VCS

Simulator to view and modify service group and resource configurations and test

failover behavior.

4..How to check the status of  VCS?

#  hastatus –summ

5..How to check the staus of VCS is operating?

#   hasys –display

6..How to see the information about the cluster?

#  haclus –display

7..How to enable the link monitoring?

#  haclus -enable LinkMonitoring

8..How to disable the  link monitoring?

#  haclus -disable LinkMonitoring

9..How to add user in the VCS?

#  hauser -add <username>

10..How to modify the user  in the VCS?

#  hauser -update <username>