Which physical interface is preferred, Summary of nic status during failover – HP LeftHand P4000 SAN Solutions User Manual
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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 21 Example Active-Passive failover scenario and corresponding NIC status
NIC status
Example 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
shows the states of Interface:Port1 and Interface:Port2 when configured for
Active-Passive.
Table 22 NIC status during failover with Active-Passive
Status of
Interface:Port2
Status of
Interface:Port1
Failover status
Preferred: No
Preferred: Yes
Normal Operation
Status: Passive (Ready)
Status: Active
Data Transfer: No
Data Transfer: Yes
Preferred: No
Preferred: Yes
Interface:Port1 Fails, Data Transfer
Fails Over to Interface:Port2
Status: Active
Status: Passive (Failed)
Data Transfer: Yes
Data Transfer: No
Preferred: No
Preferred: Yes
Interface:Port1 Restored
Status: Passive (Ready)
Status: Active
Data Transfer: No
Data Transfer: Yes
Example network cabling topologies with Active-Passive
Two simple network cabling topologies using Active-Passive in high availability environments are
shown in
and
Configuring network interface bonds
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