9.3. High Availability Using Redundancy
One way of ensuring high availability is literally to have two of everything. One can have a clustered server instead of a single server to ensure availability in case of a server failure.
Figure 9.8 shows a server with multiple HBAs. Each HBA is connected to a switch, and each switch has dual paths to the dual-ported storage device. The single point of failure in Figure 9.8 is the server. As pointed out earlier, clusters support the removal of this single point of failure. However, this section will consider a single server and explore the architecture in more detail. The focus is on the dual HBA within a single server, and once understood, the same architecture can exist on other servers within the cluster ...
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