红帽全球峰会5.7. 负载均衡策略：Cluster_Maintenance
集群维护调度策略会在维护任务期间限制集群中的活动。设定集群维护策略时：
- 除了高可用性虚拟机外，不能启动新的虚拟机。（用户可以创建高可用性虚拟机并手动启动它们。）
- 如果主机出现故障，高可用性虚拟机将正确重启，任何虚拟机都可以迁移。
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