vgscan - scan all disks for volume groups and rebuild caches
vgscan [-d|--debug] [-h|-?|--help] [--ignorelockingfailure] [--mknodes]
  [-P|--partial] [-v|--verbose]
vgscan scans all SCSI, (E)IDE disks, multiple devices and a bunch of other disk
  devices in the system looking for LVM physical volumes and volume groups.
  Define a filter in lvm.conf(5) to restrict the scan to avoid a CD ROM,
  for example.
In LVM2, vgscans take place automatically; but you might still
    need to run one explicitly after changing hardware.
See lvm for common options.
  - --mknodes
- Also checks the LVM special files in /dev that are needed for active
      logical volumes and creates any missing ones and removes unused ones.
lvm(8), vgcreate(8), vgchange(8)