10.5 HP StoreVirtual Storage User Guide (AX696-96269, March 2013)

Which physical interface is preferred
When the Active-Passive bond is created, if both NICs are plugged in, the LeftHand OS interface
becomes the active interface. The other interface is Passive (Ready).
For example, if N:Port1 is the preferred interface, it will be active and N:Port2 will be Passive
(Ready). Then, if N:Port1 fails, N:Port2 changes from Passive (Ready) to active. Interface:Port1
changes to Passive (Failed).
Once the link is fixed and Interface:Port1 is operational, there is a 30–second delay and then
Interface:Port1 becomes the active interface. Interface:Port2 returns to the Passive (Ready) state.
NOTE: When the active interface comes back up, there is a 30–second delay before it becomes
active.
Table 20 Example Active-Passive failover scenario and corresponding NIC status
NIC statusExample failover scenario
1. Active-Passive bond0 is created. The active (preferred)
interface is Interface:Port1.
• Bond0 is the master logical interface.
• Interface:Port1 is Active.
• Interface:Port2 is connected and is Passive (Ready).
2. Active interface fails. Bond0 detects the failure and
Interface:Port2 takes over.
• Interface:Port1 status becomes Passive (Failed).
• Interface:Port2 status changes to Active.
3. The Interface:Port1 link is restored.
• Interface:Port1 status changes to Active after a 30
second delay.
• Interface:Port2 status changes to Passive (Ready).
Summary of NIC status during failover
Table 21 (page 60) shows the states of Interface:Port1 and Interface:Port2 when configured for
Active-Passive.
Table 21 NIC status during failover with Active-Passive
Status of Interface :Port2Status of Interface :Port1Failover status
Preferred: NoPreferred: YesNormal Operation
Status: Passive (Ready)Status: Active
Data Transfer: NoData Transfer: Yes
Preferred: NoPreferred: YesInterface:Port1 Fails, Data Transfer
Fails Over to Interface:Port2
Status: ActiveStatus: Passive (Failed)
Data Transfer: YesData Transfer: No
Preferred: NoPreferred: YesInterface:Port1 Restored
Status: Passive (Ready)Status: Active
Data Transfer: NoData Transfer: Yes
Example network cabling topologies with Active-Passive
Two simple network cabling topologies using Active-Passive in high availability environments are
shown in Figure 32 (page 61) and Figure 33 (page 62).
60 Managing the network