The method LVM uses to set the local system ID.
Volume Groups can also be given a system ID (by vgcreate, vgchange,
or vgimport.) A VG on shared storage devices is accessible only to
the host with a matching system ID. See 'man lvmsystemid' for
information on limitations and correct usage.
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Accepted values:
  none
    The host has no system ID.
  lvmlocal
    Obtain the system ID from the system_id setting in the 'local'
    section of an lvm configuration file, e.g. lvmlocal.conf.
  uname
    Set the system ID from the hostname (uname) of the system.
    System IDs beginning localhost are not permitted.
  appmachineid
    Use an LVM-specific derivation of the local machine-id as the
    system ID. See 'man machine-id'.
  machineid
    Use the contents of the machine-id file to set the system ID.
    (appmachineid is recommended to avoid exposing the confidential
    machine-id.)
  file
    Use the contents of another file (system_id_file) to set the
    system ID.
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