How Active-Passive Bonding Works; Physical And Logical Interfaces - HP StoreVirtual 4000 User Manual

Table 16 Comparison of Active-Passive, link aggregation dynamic mode, and Adaptive Load
Balancing bonding
Feature
Bandwidth
Protection during port
failure
Protection during switch
failure
Requires support for
802.3ad link
aggregation?

How Active-Passive bonding works

Bonding NICs for Active-Passive allows you to specify a preferred interface that will be used for
data transfer. This is the active interface. The other interface acts as a backup, and its status is
"Passive (Ready)."

Physical and logical interfaces

The two NICs in the storage system are labeled as listed in
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 17 Bonded network interfaces
Failover name
bond0
eth0 or Motherboard:Port1
eth1 or Motherboard:Port2
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 18 NIC status in Active-Passive configuration
If the NIC status is
Active
Passive (Ready)
Passive (Failed)
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.
54 Managing the network
Active-Passive
Use of 1 NIC at a time
provides normal
bandwidth.
Yes
Yes. NICs can be plugged
into different switches.
No
Link aggregation dynamic
mode
Simultaneous use of both
NICs increases bandwidth.
Yes
No. Both NICs are plugged
into the same switch.
Yes
Table 17 (page
Failover description
Logical interface acting as master
Physical interface acting as slave
Physical interface acting as slave
The NIC is
Currently enabled and in use
Slave to a bond and available for failover
Slave to a bond and no longer has a link
Adaptive load balancing
Simultaneous use of both NICs
increases bandwidth.
Yes
Yes. NICs can be plugged into
different switches.
No
54). If both interfaces