Sometime we need set a resource is perferred running a node. When the
perferred  node  or some depend resources(ip,filesystem)  failed,  the
resource will fail over to another node; And if the node or its depend
resources is recovered, the resource will fail back to the perferred
node.
What I mean maybe is  not resource-stickness, because
resource-stickness means the resource stays on its origenal place, but
not its perferred place.

Here is a example for perferred node scenario(Node A,B, Resource R, A
is perferred node):

1. When A, B are both active, R is running on a.
2. When a is fail .  unplug its nic link or hba link to storage,  R is
fail over to B
3. When a is recovered, or the nic and hba link is re-plug, R is fail back to B

Thanks.
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