17.13 Using LVM2 on Multipath Devices

When using multipath, all paths to a resource are present as devices in the device tree. By default LVM checks if there is a multipath device on top of any device in the device tree. If LVM finds a multipath device on top, it assumes that the device is a multipath component and ignores the (underlying) device. This is the most likely desired behavior, but it can be changed in /etc/lvm/lvm.conf. When multipath_component_detection is set to 0, LVM is scanning multipath component devices. The default entry in lvm.conf is:

    # By default, LVM2 will ignore devices used as component paths
    # of device-mapper multipath devices.
    # 1 enables; 0 disables.
    multipath_component_detection = 1