HP P4000 9.0 HP StorageWorks P4000 SAN Solution User Guide - Page 89
Physical and logical interfaces, Requirements for Active-Passive
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Physical and logical interfaces The two NICs in the storage system are labeled as listed in Table 20 on page 89. If both interfaces are bonded for failover, the logical interface is labeled bond0 and acts as the master interface. As the master interface, bond0 controls and monitors the two slave interfaces which are the physical interfaces. Table 20 Bonded network interfaces Failover name bond0 eth0 or Motherboard:Port1 eth1 or Motherboard:Port2 Failover description Logical interface acting as master Physical interface acting as slave Physical interface acting as slave The logical master interface monitors each physical slave interface to determine if its link to the device to which it is connected, such as a router, switch, or repeater, is up. As long as the interface link remains up, the interface status is preserved. Table 21 NIC status in Active-Passive configuration If the NIC status is The NIC is Active Passive (Ready) Passive (Failed) Currently enabled and in use Slave to a bond and available for failover Slave to a bond and no longer has a link If the active NIC fails, or if its link is broken due to a cable failure or a failure in a local device to which the NIC cable is connected, then the status of the NIC becomes Passive (Failed) and the other NIC in the bond, if it has a status of Passive (Ready), becomes active. This configuration remains until the failed preferred interface is brought back online. When the failed interface is brought back online, it becomes Active. The other NIC returns to the Passive (Ready) state. Requirements for Active-Passive To configure Active-Passive: • Both NICs should be enabled. • NICs should be connected to separate switches. Which physical interface is preferred When the Active-Passive bond is created, if both NICs are plugged in, the SAN/iQ software interface becomes the active interface. The other interface is Passive (Ready). For example, if Eth0 is the preferred interface, it will be active and Eth1 will be Passive (Ready). Then, if Eth0 fails, Eth1 changes from Passive (Ready) to active. Eth0 changes to Passive (Failed). Once the link is fixed and Eth0 is operational, there is a 30-second delay and then Eth0 becomes the active interface. Eth1 returns to the Passive (Ready) state. P4000 SAN Solution user guide 89
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