Compaq ProLiant 6500 Compaq Parallel Database Cluster Model PDC/O2000 for Orac - Page 93
Table 2-9
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Cluster Architecture 2-69 Table 2-9 I/O Path Failure and Failover Scenarios in Redundant FC-ALs for Active/Active Configurations With Two or More RA4000/RA4100 Arrays continued Description of Failure Failover Response A Storage Hub or FC-AL Switch fails. Secure Path makes each active array controller to which the failed Storage Hub or FC-AL Switch is connected inactive. The standby array controller in each affected RA4000/RA4100 Array becomes the active array controller. The Storage Hub or FC-AL Switch that is connected to the new active array controllers becomes the active I/O path for these RA4000/RA4100 Arrays. In each node, the Fibre Host Adapter that is connected to the failed Storage Hub or FC-AL Switch becomes inactive, and all I/O activity is rerouted through the other Fibre Host Adapter in the pair and the remaining active Storage Hub or FC-AL Switch. The Fibre Channel cable connection between a Storage Hub or FC-AL Switch and a Fibre Host Adapter in one node is broken. Secure Path makes all I/O path connections between the affected Fibre Host Adapter and active array controllers inactive. The standby array controller in every affected RA4000/RA4100 Array becomes the active array controller. The Storage Hub or FC-AL Switch connected to the newly active array controllers becomes the active I/O path for the entire FC-AL. The Storage Hub or FC-AL Switch connected to the failed Fibre Channel cable becomes inactive. The second Fibre Host Adapter in each node, which is connected to the only active Storage Hub or FC-AL Switch, becomes the only active Fibre Host Adapter in the node's pair. A Fibre Host Adapter in a node fails. Secure Path makes all I/O path connections between the affected Fibre Host Adapter and active array controllers inactive. The standby array controller in every affected RA4000/RA4100 Array becomes the active array controller. The Storage Hub or FC-AL Switch connected to the newly active array controllers becomes the active I/O path for the entire FC-AL. The Storage Hub or FC-AL Switch connected to the failed Fibre Host Adapter becomes inactive. The second Fibre Host Adapter in each node, which is connected to the only active Storage Hub or FC-AL Switch, becomes the only active Fibre Host Adapter in the node's pair.