From LQWiki

lvscan is an LVM command that scans volume groups and logical volumes.

example:

lvscan
 ACTIVE            '/dev/system/home' [100.00 GB] inherit
 ACTIVE            '/dev/system/opt' [10.00 GB] inherit
 ACTIVE            '/dev/system/tmp' [10.00 GB] inherit
 ACTIVE            '/dev/system/usr' [10.00 GB] inherit
 ACTIVE            '/dev/system/var' [10.00 GB] inherit