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EMC官方资料明确说明了在Linux平台如果安装了PowerPATH,那么所有的存储设备都要由PowerPATH控制（If PowerPath is installed, all storage array devices must be controlled by PowerPath.）。Linux DM(Device Mapper)与PowerPATH不可以共存。EMC官方说明如下：

详情请参考EMC官方文档：EMC Host Connectivity Guide 201704.pdf