It would appear that you asked the wrong question.
The question you actually seem to have wanted answered was:
How do I find the physical device, which contains the logical volume that is mounted on /
Take logical volume group name from the logical device name, then use it in place of volume_group_name
in this command:
vgdisplay -v volume_group_name
For me that displays information on the volume group as a whole, the individual logical volumes within the group, and lists the physical volumes that contain the logical volume group.
I simply use the manual pages for information.
apropos keyword | less
is nice for finding things. If you don't have the apropos
command, you should be able to substitute man -k