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    Ubuntu18.04.4 remove lvm devices in /dev/mapper without vg and lv info

    Hello, everybody. the question is that I use zfs to create a block device with lvm2 format by pvcreate,vgcreate and lvcreate command, Unlucky,one day the device information lost beacause the machine suddenly went out. when the machine reboot, the infomation of devices lost with unknown reason...