[Pacemaker] why does pacemaker execute fence action immediately when the target node becomes UNCLEAN?

[bin chen]

Hi,all
I have defined a fence resource ,and cloned it.But when a node becomes
UNCLEAN(I disconneted its network),the fence action will be executed
immediately.Is there a method to avoid it(for example,a network tolerance
time for network flash time )?For if the network is not stable,
 I don`t want cluster nodes be fenced again and again.:)

Thanks
Cherish
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