HP B6960-96035 - Manual (Page 80)

Figure 19 Typical cluster
Components:
• Cluster nodes (two or more)
• Local disks
• Shared disks (shared between nodes)
Cluster nodes
Cluster nodes are computers that compose a cluster. They are physically connected
to one or more shared disks.
Shared disks
The shared disks volumes (MSCS, Novell NetWare Cluster Services) or shared volume
groups (MC/SG, Veritas Cluster) contain mission-critical application data as well as
specific cluster data needed to run the cluster. In MSCS clusters, a shared disk is
exclusively active on only one cluster node at a time.
Cluster network
A cluster network is a private network that connects all cluster nodes. It transfers the
internal cluster data called heartbeat of the cluster. The heartbeat is a data packet
with a time stamp that is distributed among all cluster nodes. Each cluster node
compares this packet and determines the cluster node that is still operational so that
Planning your backup strategy 80