6.2 HP IBRIX 9000 Storage Network Best Practices Guide (TA768-96069, December 2012)

Example FSN failover

The following example illustrates what occurs when a file serving node is forced to fail over. The

example shows an IBRIX 9730 platform in a unified network topology. All IP addresses and other

identifiers have been chosen for illustration purposes and could be different on a customer

installation.

In this example, the cluster starts with two active file serving nodes. FSN 1 has the active Fusion

Manager and is serving files from IP address 10.30.214.202. FSN 2 is serving files from IP address

10.30.214.203. Figure 4 illustrates the initial state of this cluster. The interfaces in bold (bond

0) are active on the FSN, while the other interfaces are the standby interfaces that have been put

in place for failover.

Figure 4 FSN failover example — start state

Initially, FSN 1 has three active interfaces and one standby interface:

• bond0 is the cluster network interface

• bond0:0 is a cluster network VIF for the active Fusion Manager

• bond0:2 is a user network VIF for file serving from FSN 1

• bond0:3 is not active, but has been provisioned for failover of file serving duties from

FSN 2

Initially, FSN 2 has two active interfaces and two standby interfaces:

• bond0 is the cluster network interface

• bond0:0 is not active, but has been provisioned to support Fusion Manager failover.

• bond0:2 is a user network VIF for file serving from FSN 2

• bond0:3 is not active, but is n provisioned for failover of file serving duties from FSN 1

The ibrix_nic command displays the cluster-wide configuration of the network. Before failing

over FSN1, the output would be similar to the following:

To see how this maps onto each FSN, check the output of the Linux ifconfig command for each

FSN. The ifconfig output shows only the active interfaces. VIFs and failover are handled at the

IBRIX solution layer, which dynamically creates and removes the necessary interfaces on the FSNs

to react to conditions that cause failover.

User VIF failover 13