Device mapper

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wikipedia:Device mapper

/dev/mapper/
/dev/mapper/control



vgchange -a|--activate y|n|ay
The block device for the LV is added or removed from the system using device-mapper in the kernel. A symbolic link /dev/VGName/LVName pointing to the device node is also added/removed.


vgchange -a n VG_NAME
 0 logical volume(s) in volume group "VG_NAME" now active
vgchange -a y VG_NAME
 1 logical volume(s) in volume group "VG_NAME" now active



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