What is VCS Linux?

What is VCS Linux?

Veritas Cluster Server (VCS) monitors systems and application services, and restarts services when hardware or software fails. A single VCS cluster consists of multiple systems that are connected in various combinations to shared storage devices. VCS monitors and controls applications running in the cluster on nodes.

What is VCS device?

The Cisco TelePresence Video Communication Server (VCS) provides flexible and extensible video conferencing applications.

What is the dev folder in Linux?

/dev is the location of special or device files. It is a very interesting directory that highlights one important aspect of the Linux filesystem – everything is a file or a directory.

What does Dev mean in terminal?

How do I start VCS?

Starting VCS

1. Log in as root user.
2. Start LLT and GAB. Start I/O fencing if you have configured it. Skip this step if you want to start VCS on a single-node cluster.
3. Start the VCS engine. # hastart. To start VCS in a single-node cluster, run the following command: # hastart -onenode.

What is cluster in Linux Redhat?

Red Hat Cluster Suite (RHCS) is an integrated set of software components that can be deployed in a variety of configurations to suit your needs for performance, high-availability, load balancing, scalability, file sharing, and economy.

What is the difference between VCS and expressway?

The VCS series is better suited for customers who use video communication only and have no need to support voice over IP phones and other voice related services. The Expressway series, on the other hand, is more suited for customers who need to support voice over IP phones or other voice related services.

How do I switch to virtual console?

Alt + ← changes to the previous virtual console and Alt + → to the next virtual console.

What does the vcs0 stand for in Linux?

/dev/vcs0 is a character device with major number 7 and minor number 0, usually of mode 0644 and owner root.tty. It refers to the memory of the currently displayed virtual console terminal.

What should the VCS status of a cluster mean?

Clearly, your situation is bad: A normal VCS status should indicate that all nodes in the cluster are “RUNNING” (which these are). However, it should also show all service groups as being ONLINE on at least one of the nodes, which isn’t the case above with SG_TWO (Service Group 2).

What does atomic broadcast do in VCS cluster?

Atomic Broadcast ensures all active system receive all messages, for every resource and service group in the cluster. Atomic means that all system receive the update, if one fails then the change is rolled back on all systems. The HAD tracks all changes within the cluster configuration and resource status by communicating with GAB.

What is a Hybrid Service Group in VCS 4.0?

Hybrid – A hybrid service group is a combination of a failover service group and a parallel service group used in VCS 4.0 replicated data clusters, which are based on Veritas Volume Replicator. When a service group appears to be suspended while being brought online you can flush the service group to enable corrective action.