Vcs display master node
#Vcs display master node software
Service groups A service group is a virtual container that contains all the hardware and software resources that are required to run the managed application. Failure of a Persistent resource triggers a service group failover. VCS monitors Persistent resources to ensure their status and operation. A Persistent resource has an operation value of none.
For example, a network interface card cannot be started or stopped, but it is required to configure an IP address. These resources cannot be brought online or taken offline. VCS starts the daemons if required, but does not stop them if the associated service group is taken offline. For example, VCS requires NFS daemons to be running to export a file system. VCS starts On-Only resources, but does not stop them. For example, VCS imports a disk group when required, and deports it when it is no longer needed. VCS starts and stops On-Off resources as required. In VCS there are three categories of resources: ■ On-Off. Resource dependencies are graphically depicted in a hierarchy, also called a tree, where the resources higher up (parent) depend on the resources lower down (child).Ĭategories of resources Different types of resources require different levels of control. Resource dependencies indicate resources that depend on each other because of application or operating system requirements. Resources include disk groups and file systems, network interface cards (NIC), IP addresses, and applications. VCS is primarily an HA cluster With support for some key parallel processing applications like Oracle RAC Resources and resource dependencies Resources are hardware or software entities that make up the application.Cluster” is an broadly used term High Availability (HA) clusters Parallel processing clusters Load balancing clusters High Performance Computing (HPC) clusters.A failover is similar to a switchover, except the ordered shutdown of applications on the original node may not be possible, so the services are started on another node
A switchover is an orderly shutdown of an application and it’s supporting resources on one server and a controlled startup on another server. Sire/infrastructure failure = Power outage, natural and other disasters.Component failure = CPU, NIC, HBA, DISK, software crash.Logical failures= software, bugs, operator error, viruses.Availability: Reduce planned and unplanned downtime of application. When a node or a monitored application fails, other nodes can take predefined actions to take over and bring up services elsewhere in the cluster. VCS links commodity hardware with intelligent software to provide application failover and control. Each system, or node, runs its own operating system and cooperates at the software level to form a cluster. What is a VCS cluster? VERITAS Cluster Server (VCS) from Symantec connects multiple, independent systems into a management framework for increased availability*.
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