Thecus N16000 Series User Manual page 86

Communications Configuration
UDP
Heartbeats interface
Auto Fail Back:
ix. Click "Apply" and now Active server will prompt the message below to wait
the "Standby" server setting to be completed.
The udp port directive specifies which port Heartbeat will use
for its UDP intra-cluster communication. The default value for
this parameter is UDP 694 port.
Select interfaces are used for heartbeat communications.
In legacy Heartbeat clusters, the auto failback option would
determine whether a resource would automatically fail back to
its "Active" node, or remain on whatever node is serving it until
that node fails, or an administrator intervenes. The possible
values for auto failback were:
on - enable automatic failbacks
off - disable automatic failback
When auto failback is off (default): After the original
active server is damaged and then returned to a healthy
state, the original standby server will remain active and
the original active server will go into standby mode. The
servers will exchange roles.
When auto failback is on: After the original active server is
damaged and then returned to a healthy state, the original
standby server will go back into standby mode and the
original active server will become active again. The
servers return to their original roles.
With or without auto failback, synchronization will begin
immediately without a break in service when the damaged
server returns. The roles described above are assumed
immediately and do not need to wait for synchronization.
The virtual IP will always be mapped to the current active
server.
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