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4.5. 使用 unfencing 配置基于存储的 Fence 设备
创建 SAN/存储 fence 设备时（即使用非基于电源的 fencing 代理），必须在创建
stonith 设备时设定元数据选项 provides=unfencing。这样可保证隔离的节点在节点重启前处于未隔离状态，并在该节点中启动集群服务。
配置基于电源的 fence 设备时不一定要设定
provides=unfencing 元数据选项，因为该设备本身为节点提供电源以便其引导（并尝试重新加入集群）。在这种情况下的引导动作表示出现 unfencing 状态。
以下命令配置名为
my-scsi-shooter，使用 fence_scsi fence 代理为该设备启用 unfencing 的 stonith 设备。
pcs stonith create my-scsi-shooter fence_scsi devices=/dev/sda meta provides=unfencing
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