设备的字段专门用于指示设备的路径状态。
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当设备有多个目标路径（存储阵列）时，路径状态为“ on ”。
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当目标的所有路径都关闭（关闭/死亡）时，设备状态为“ 死 ”。
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如果目标只有一条路径，则状态为“ 降级 ”。
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当ESX使用设备时，从存储阵列取消映射设备时，设备的状态为“ 未连接 ”。
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如果ESX无法识别设备的状态（如果上述所有方案都不适用），则设备状态为“ 未知 ”。
The field for the device is specifically reserved for indicating the path status of the device.
–> When the device has more than one path to the target( storage array), the path status is "on".
–> When all the paths to the target are down ( either off / dead ) the device status is "dead".
–> If there is only one path to the target then the status is "degraded".
–> When a device is unmapped from the storage array while ESX was using the device the status of the device is "not connected".
–> If ESX fails to recognize the state of the device ( if all above mentioned scenarios are not applicable) then the device status is "unknown".