两种办法都是在联线服务组之前，校验以确保这个服务组的IP地址没有被其他系统使用。
Both methods check to make sure the IP addresses for this service group are not being used by another system before onlining the service group.
服务组心跳 -磁盘心跳将在服务组联线前被校验。
Service Group Heartbeats - Disk heartbeats that are checked before a service group is brought online.
IP校验 -这种方法无论在preonline-ipc时间连锁反应中，或是在简单地令一个IP资源成为服务组中首要联线的资源都适用。
IP Checking - This method is used in either the preonline-ipc event trigger, or simply make an IP resource the first resource to online in the service group.
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