Compaq ProLiant 8500 Compaq Parallel Database Cluster Model PDC/O2000 for Orac - Page 72
Table 2-6, Features of Active/Standby and Active/Active Configurations for Redundant Fibre
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2-48 Compaq Parallel Database Cluster Model PDC/O2000 for Oracle8i and Windows 2000 Administrator Guide See "Active/Standby Configuration Examples for Redundant FC-ALs" in this chapter for a detailed description of active/standby configuration examples for a redundant FC-AL with from one to five RA4000/RA4100 Arrays. See "Active/Active Configuration Examples for Redundant FC-ALs" for a detailed description of active/active configuration examples when two to five RA4000/RA4100 Arrays are present. Table 2-6 identifies the features of the active/standby and active/active configurations for redundant FC-ALs. Table 2-6 Features of Active/Standby and Active/Active Configurations for Redundant Fibre Channel Arbitrated Loops I/O Path Configuration Active/standby with one RA4000/RA4100 Array Active/standby with two or more RA4000/RA4100 Arrays Advantage Active/standby is the only I/O path configuration you can use in a redundant FC-AL that contains just one RA4000/RA4100 Array. Provides true cabling symmetry between the Storage Hubs or FC-AL Switches and array controllers. A Storage Hub or FC-AL Switch connects to the same array controller slot (top or bottom) in every RA4000/RA4100 Array. Disadvantage Load balancing between the two Storage Hubs or FC-AL Switches is less than ideal because the connection to the active array controller in every RA4000/RA4100 Array is routed through the same Storage Hub or FC-AL Switch. The second Storage Hub or FC-AL Switch provides no active I/O pathway unless an active array controller or its cable connection to the first Storage Hub or FC-AL Switch fails. continued
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