Table 83 Recovery Requirements After A Link Down State For All Member Ports - Fujitsu ETERNUS DX S5 Series Design Manual

5. Connection Configuration
NAS Connection
• Mode 5 (balance-tlb)
Enables performance improvements (load balancing). Transmission performs a load balance dynamically
according to the speed (load status) of each NAS port. Only one port is used for receiving at any time.
Connecting a different switch to each port can improve fault tolerance. The switch to be connected must
support Internet Group Management Protocol (IGMP).
• Mode 6 (balance-alb)
Enables performance improvements (load balancing). In addition to the Mode 5 (balance-tlb) function, load
balancing is also performed when receiving data. In reception, data is distributed according to the settings in
the connection destination.
Connecting a different switch to each port can improve fault tolerance. The switch to be connected must
support Internet Group Management Protocol (IGMP).
Note
During the configuration phase
Set the same transfer rate and transfer mode for interface ports configured in the single Bonding.
Combining interface ports with differing transfer rates and transfer modes is not recommended.
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Recovery Requirements After a Link Down State for All Member Ports
Specify "1" for the "linkaggregation collecting minimum count" in the switch setting. If a value other than "1" is
set, the operation may not work correctly. For switches other than the Fujitsu SR-X series, this set item may have
different names and specifications.
For example, if "1" is specified for the "linkaggregation collecting minimum count" when four ports are used to
configure Bonding, the Bonding function remains enabled until all of the four ports become unavailable. When
one of the failed ports is restored for communication after all of the ports have failed, the Bonding function is
enabled.
The requirements to recover communication using the Bonding function after all ports have failed are shown in
the following table. Note that a failback condition is applied when a multipath connection is configured with
Bonding.
Table 83 Recovery Requirements After a Link Down State for All Member Ports
Whether or not the multipath
configuration has been configured
with Bonding
No
Yes
Bonding mode
Any mode
Any mode
227
Recovery requirements
Any one port must be linked up
All member ports must be linked up
Design Guide