HP P4000 9.0 HP StorageWorks P4000 SAN Solution User Guide - Page 95
Which physical interface is active, Summary of NIC states during failover
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Which physical interface is active When the Adaptive Load Balancing bond is created, if both NICs are plugged in, both interfaces are active. If one interface fails, the other interface continues operating. For example, suppose Motherboard:Port1 and Motherboard:Port2 are bonded in an Adaptive Load Balancing bond. If Motherboard:Port1 fails, then Motherboard:Port2 remains active. Once the link is fixed and Motherboard:Port1 is operational, it becomes active again. Motherboard:Port2 remains active. Table 26 Example Adaptive Load Balancing failover scenario and corresponding NIC status Example failover scenario 1. Adaptive Load Balancing bond0 is created. Motherboard:Port1 and Motherboard:Port2 are both active. NIC status • Bond0 is the master logical interface. • Motherboard:Port1 is Active. • Motherboard:Port2 is Active. 2. Motherboard:Port1 interface fails. Because Adaptive • Motherboard:Port1 status becomes Passive Load Balancing is configured, Motherboard:Port2 con- (Failed). tinues operating. • Motherboard:Port2 status remains Active. 3. Motherboard:Port1 link failure is repaired. • Motherboard:Port1 resumes Active status. • Motherboard:Port2 remains Active. Summary of NIC states during failover Table 27 on page 95 shows the states of Motherboard:Port1 and Motherboard:Port2 when configured for Adaptive Load Balancing. Table 27 NIC status during failover with Adaptive Load Balancing Failover status Normal Operation Status of Motherboard:Port1 Preferred: No Status: Active Data Transfer: Yes Status of Motherboard:Port2 Preferred: No Status: Active Data Transfer: Yes Motherboard:Port1 Fails, Data Transfer Fails Over to Motherboard:Port2 Preferred: No Status: Passive (Failed) Data Transfer: No Preferred: No Status: Active Data Transfer: Yes Motherboard:Port1 Restored Preferred: No Status: Active Data Transfer: Yes Preferred: No Status: Active Data Transfer: Yes Example network cabling topologies with Adaptive Load Balancing A simple network configuration using Adaptive Load Balancing in a high availability environment is illustrated (Figure 38 on page 96). P4000 SAN Solution user guide 95
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