multipath: error getting device

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dmesg有如下类似错误提示：

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kernel: device-mapper: table: 253:3: multipath: error getting device
kernel: device-mapper: ioctl: error adding target to table
kernel: device-mapper: table: 253:3: multipath: error getting device
kernel: device-mapper: ioctl: error adding target to table

极有可能是因为multipathd试图在一个已经打开的设备上创建多路径设备，通常是因为这些设备并不是多路径设备，应该在配置文件中屏蔽掉而没有屏蔽的原因。

Are most likely due to multipathd attempting to create a multipath device on top of an already opened device. This is usually because there are device that should be blacklisted which are not.

References:
[1]multipath: error getting device

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