Compaq StorageWorks 4000 - RAID Array White Paper page 10

Understanding Compaq StorageWorks RAID Array 4000 and Infrastructure Cabling
The RA4000 brings no single point of failure (NSPOF) functionality to workgroup and
departmental servers with optional redundant array controllers and failover software. In a
redundant configuration, if the active controller or other component fails or becomes inoperative,
the standby controller will take over, notify the system administrator of the problem, and maintain
operation of the storage subsystem.
Figure 5 shows the minimum hardware requirements for a single server and single RA4000 with
NSPOF.
Figure 5. Single server and redundant controller configuration
Clustered Server Environments
Figure 6 shows a clustered configuration without NSPOF.
Figure 6. Single controllers in a clustered configuration
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