Cl
us
ter Node A
Node A
HBA 1
Priv
a
te Network
Node A
HBA 2
Node B
HBA 2
Cl
us
ter Node B
Node B
HBA 1
S
AN
S
witch
S
AN
S
witch
S
tor
a
ge Are
a
Network
Cl
us
ter
Q
u
or
u
m
Mirror
s
et
LUN 1
D
a
t
a
RAID
s
et
Node A
LUN 2
D
a
t
a
RAID
s
et
Node B
LUN 3
+
+
+
+
+++++++++++++++++++++++++++++++++++++++++++++++++++
+
+
+
+
+
+
+
+
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 de
fi
ning characteristics:
•
They can be brought online and taken of
fl
ine.
•
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
fi
le 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
fi
le shares to the clients.
118
Cluster administration
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