HP DL160 HP ProLiant Storage Server User Guide (440584-004, February 2008) - Page 125
Cluster administration, Cluster overview
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9 Cluster administration NOTE: Not all HP ProLiant Storage Servers can be clustered. See the HP ProLiant Storage 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 can operate as a single node or as a cluster. This chapter discusses cluster installation and cluster management issues. Cluster overview Up to eight server nodes can be connected to each other and deployed as a no single point of failure (NSPOF) cluster. Utilizing a private network allows communication amongst themselves in order to track the state of each cluster node. Each node sends out periodic 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 and the cluster. Clustering servers greatly enhances the availability of file serving by enabling file shares to fail over to additional storage servers if problems arise. Clients see only a brief interruption of service as the file share resource transitions from one server node to the other. HP ProLiant Storage Server 125