Chapter 1. Introduction to IBM High-Availability Cluster Solutions
A cluster is a type of parallel or distributed system that consists of interconnected
computers used as a single, unified computing resource.
In other words, a group of computers linked together in such a way that they share and manage a set
of resources that can support a number of users at the same time.
This high-availability clustering solution is based on a two-node cluster, where both nodes, or servers, can
access the same storage devices, but only one server at a time controls the storage devices shared by
both servers.
If one server fails, the remaining server automatically assumes control of the resources that the failed
server was using, while still controlling its own resources at the same time.
The failed server can then be repaired offline without the loss of time or work efficiency, because access
to that server data and applications is still available.
When the failed server is operational again, it can be placed back into the cluster, the resources are reallocated between
the two servers, and the cluster can then resume normal operations.
IBM high-availability cluster solutions, as discussed in this manual, use IBM ServeRAID II adapters and
IBM expansion enclosures, such as the IBM Enterprise Expansion Enclosure (Model 3518), the
IBM PC Server 3519 Rack Expansion Enclosure, the IBM Netfinity EXP10 Rack Expansion Enclosure, or the IBM
Netfinity EXP15 Rack Expansion Enclosure.
IBM high-availability cluster solutions can be installed using one of the following:
Note B: Server B
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