Cluster Terms And Components; Virtual Servers; Storage Server Cluster Diagram; Resources - HP ProLiant DL380 G5 Administration Manual

Cluster Node A
Node A
HBA 1
Figure 56 Storage server cluster diagram

Cluster terms and components

Nodes
The most basic parts of a cluster are the servers, referred to as nodes. A server node is any individual
computer in a cluster, or a member of the cluster.

Resources

Hardware and software components that are managed by the cluster service are called cluster resources.
Cluster resources have three defining characteristics:
• They can be brought online and taken offline.
• They can be managed in a cluster.
• They can be owned by only one node at a time.
Examples of cluster resources are IP addresses, network names, physical disk resources, and file shares.

Virtual servers

A virtual server is a cluster group that consists of a static IP Address resource and a Network Name
resource. Several virtual servers can be created. By assigning ownership of the virtual servers to the
different server nodes, the processing load on the storage servers can be distributed between the nodes
of a cluster.
The creation of a virtual server allows resources dependent on the virtual server to fail over and fail back
between the cluster nodes. File share and physical disks resources are assigned to the virtual server to
ensure non-disruptive service of file shares to the clients.
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Cluster administration
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Node B
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HBA 2
SAN Switch
Storage Area Network
Cluster
Quorum
Mirrorset
LUN 1
Private Network
Node A
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HBA 2
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SAN Switch
Data RAID set
Data RAID set
Node A
LUN 2
Cluster Node B
Node B
HBA 1
Node B
LUN 3