Category: VCS Troubleshooting

VCS information Center

  VCS for Beginners Read – VCS for Beginners – Getting Started with VCS Read – VCS for Beginners– Cluster Membership & IO Fencing Read – VCS for Beginners – Understand Jeopardy Condition with real time scenerio Read – VCS for Beginners – Configuring Veritas Cluster...

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VCS : Configure GAB manually

    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...

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VCS Learning – I/O Fencing In action [ Video ]

This post is all about the purpose of I/O fencing and how i/o fencing works to avoid the split brain condition?. Normally, I do spend  4 to 6 hours to post a technical article  with complete details, but for this one I have spent lot more...

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VCS : Configuring Veritas Cluster and Configuration files

About the VCS configuration files VCS configuration files include the following: main.cf The installer creates the VCS configuration file in the /etc/VRTSvcs/conf/config folder by default during the VCS configuration. The main.cf file contains the minimum information that defines the cluster and its nodes. types.cf The file...

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VCS : Starting LLT , GAB and VCS manually

  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. LLT configuration files are as follows: /etc/llthosts—lists all...

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VCS : verify if the VERITAS Cluster Server configuration database is open(RW) or closed(RO))

Use the following command to display the current state of the Veritas Cluster Server(VCS) configuration database: # haclus -display | grep ReadOnly ReadOnly 1 A result code of 1 indicates the configuration database is in a closed(ReadOnly) state. A result code of 0 indicates the configuration...

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VCS : Understand Jeopardy Condition with real time scenerio

VCS facing the  following Issue  :  Service group not failing over when server rebooted. Error messages in /var/adm/messages file: Mar 18 15:26:48 p-vhs-ntt01b-d2 gab: [ID 316943 kern.notice] GAB INFO V-15-1-20036 Port a gen ef2e0f membership 01 Mar 18 15:26:48 p-vhs-ntt01b-d2 gab: [ID 608499 kern.notice] GAB INFO...

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VCS : Configure /etc/llttab

The /etc/llttab file must specify the system’s ID number (or its node name), its cluster ID, and the network links that correspond to the system. In addition, the file can contain other directives. Refer also to the sample llttab file in /opt/VRTSllt. Run the dladm show-dev command...

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VCS : Disabling the VCS agent

  To disable the agent on a system, you must first change the VCS service group to an OFFLINE state. You can stop the application completely, or switch the service group to another system. To disable the agent Determine if the service group is online. At...

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VCS : Sample Configuration to add new Service Groups

Below are the some sample configurations on how do we  configure new service groups  in two common scenarios i.e. while VCS online and while the  VCS is stopped. It is good to know this information to perform various dynamic configuration to VCS cluster without disrupting the...

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