Hp ProLiant DL585 G2 Storage-Server User Manual Page 97

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8 Cluster administration
NOTE:
Not all HP ProLiant Storage Servers can be clustered. See the HP ProLiant Stora ge Server QuickSpecs to
determine if your storage server can be clustered. Windows Storage Server 2003 Release 2 clusters
can include up to eight nodes.
One important feature of the HP ProLiant Storage Server clusterable models is that they c an operate as a
single node or as a cluster. This chapter discusses cluster installation and cluster management issues.
Cluster ov ervie w
Up to eight server nodes can be connected to each other and de ployed as a no single point of failure
(NSPOF) cluster. U tilizing a private net work allows communication amongst themselves in order to
track the state of each cluster node. Each node sends out p eriodic messages to the other nodes; these
messages are called heartbeats. If a node stops sending heartbeats, the cluster service fails over any
resources that the node owns to another node. For example, if the node that owns the Quorum disk is
shut down for any reason, its heartbeat stops. The other nodes detect the lack of the heartbeat and
another node takes over ownership of the Quorum disk a nd the cluster.
Clustering servers greatly enhances the availability of le serving by enabling le shares to fail over to
additional storage servers if problems arise. Clients see only a brief interruption of service as the le
share resource transitions from one server node to the other.
HP ProLiant Storage Server 97
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