HP Integrity rx5670 Windows Integrity Cluster Installation and Configuration G - Page 12

Cluster terminology, Nodes, Cluster service, Shared disks, Resources - 4 way server

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Introduction Cluster terminology Cluster terminology A working knowledge of clustering begins with the definition of some common terms. The following terms are used throughout this document. Nodes Individual servers, or members of a cluster, are referred to as nodes or systems (the terms are used interchangeably). A node can be an active or inactive member of a cluster, depending on whether or not it is currently online and in communication with the other cluster nodes. An active node can act as host to one or more cluster groups. Cluster service Cluster service refers to the collection of clustering software on each node that manages all cluster-specific activity. Shared disks The shared disks are devices (normally hard drives) that the cluster nodes are attached to by way of a shared bus. Applications, file shares, and other resources that will be managed by the cluster are stored on the shared disks. Resources Resources are physical or logical entities (such as a file share) managed by the cluster software. Resources may provide a service to clients or be an integral part of the cluster. Examples of resources would be physical hardware devices such as disk drives, or logical items such as IP addresses, network names, applications, and services. Resources are the basic unit of management by the Cluster service. A resource can only run on a single node in a cluster at a time, and is said to be online on a node when it is providing its service on that specific node. At any given time, a resource can exhibit only one of the following states: • Offline • Offline pending • Online • Online pending • Failed When a resource is offline, it is unavailable for use by a client or another resource. When a resource is online, it is available for use. The initial state of any resource is offline. When a resource is in one of the pending states, it is in the process of either being brought online or taken offline. If the resource cannot be brought online or taken offline after a specified amount of time, and the resource is set to the failed state, you can specify the amount of time that Cluster service waits before failing the resource by setting its pending timeout value in Cluster Administrator. 12 Chapter 1

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Introduction
Cluster terminology
Chapter 1
12
Cluster terminology
A working knowledge of clustering begins with the definition of some common terms.
The following terms are used throughout this document.
Nodes
Individual servers, or members of a cluster, are referred to as nodes or systems (the
terms are used interchangeably). A node can be an active or inactive member of a cluster,
depending on whether or not it is currently online and in communication with the other
cluster nodes. An active node can act as host to one or more cluster groups.
Cluster service
Cluster service refers to the collection of clustering software on each node that manages
all cluster-specific activity.
Shared disks
The shared disks are devices (normally hard drives) that the cluster nodes are attached
to by way of a shared bus. Applications, file shares, and other resources that will be
managed by the cluster are stored on the shared disks.
Resources
Resources are physical or logical entities (such as a file share) managed by the cluster
software. Resources may provide a service to clients or be an integral part of the cluster.
Examples of resources would be physical hardware devices such as disk drives, or logical
items such as IP addresses, network names, applications, and services. Resources are the
basic unit of management by the Cluster service. A resource can only run on a single
node in a cluster at a time, and is said to be online on a node when it is providing its
service on that specific node.
At any given time, a resource can exhibit only one of the following states:
•
Offline
•
Offline pending
•
Online
•
Online pending
•
Failed
When a resource is offline, it is unavailable for use by a client or another resource. When
a resource is online, it is available for use. The initial state of any resource is offline.
When a resource is in one of the pending states, it is in the process of either being
brought online or taken offline. If the resource cannot be brought online or taken offline
after a specified amount of time, and the resource is set to the failed state, you can
specify the amount of time that Cluster service waits before failing the resource by
setting its pending timeout value in Cluster Administrator.