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Cluster Node A
Node A
HBA 1
Private Network
Node A
HBA 2
Node B
HBA 2
Cluster Node B
Node B
HBA 1
SAN Switch
SAN Switch
Storage Area Network
Cluster
Quorum
Mirrorset
LUN 1
Data RAID set
Node A
LUN 2
Data RAID set
Node B
LUN 3
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Figure 56 Storage server c luster 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.
Resourc
es
Hardware and software components that are mana ge d by the cluster service are called cluster resources.
Cluster r esources have three defining characteristics:
• They can be brought online and taken offline.
• They ca
n be m anaged in a cluster.
• Theycanbeownedbyonlyonenodeatatime.
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 Net work Name
resource. Several virtual servers can be created. By assigning ownership of the virtual servers to the
different server nodes, the pro cessing load on the storage servers can be distributed between the nodes
of a cluster.
The creation of a virtual server allows resources de pendent 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 ser ver to
ensure non-disruptive ser vice of file shares to the clients.
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Cluster administration