If all the real servers are down then a fall-back server is inserted into the pool, which will made quiescent one of the real web servers comes back on line.
If all the real servers are down then a fall-back server is inserted into the pool, which will made quiescent one of the real web servers comes back on line.
如果一个真实服务器实效了，就会被移出集群。当该服务器正常工作后，会在群集中重新激活。