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4.6 Specifying Resource Failback
Nodes (Resource Stickiness)
A resource might fail back to its original node when that node is back online and in the
cluster. If you want to prevent a resource from failing back to the node it was running
on prior to failover, or if you want to specify a different node for the resource to fail
back to, you must change its resource stickiness value. You can either specify resource
stickiness when you are creating a resource, or afterwards.
Consider the following when specifying a resource stickiness value:
Value is
0
:
This is the default. The resource will be placed optimally in the system. This may
mean that it is moved when a “better” or less loaded node becomes available. This
option is almost equivalent to automatic failback, except that the resource may be
moved to a node that is not the one it was previously active on.
Value is greater than
0
:
The resource will prefer to remain in its current location, but may be moved if a
more suitable node is available. Higher values indicate a stronger preference for a
resource to stay where it is.
Value is less than
0
:
The resource prefers to move away from its current location. Higher absolute values
indicate a stronger preference for a resource to be moved.
Value is
INFINITY
:
The resource will always remain in its current location unless forced off because
the node is no longer eligible to run the resource (node shutdown, node standby,
reaching the
migration-threshold
, or configuration change). This option
is almost equivalent to completely disabling automatic failback .
Value is
-INFINITY
:
The resource will always move away from its current location.
Configuring Cluster Resources with the GUI 45