DM multipath kernel driver not loaded

Issue

• Device mapper Multipath fails to start.

  $ modprobe -v dm-multipath
  $ multipath -ll
  Oct 20 05:38:56 | DM multipath kernel driver not loaded
  Oct 20 05:38:56 | No configuration dir '/etc/multipath/conf.d'
  Oct 20 05:38:56 | libdevmapper version 1.02.158-RHEL7 (2019-05-13)
  Oct 20 05:38:56 | DM multipath kernel driver not loaded
  
  $ systemctl status multipathd
  ● multipathd.service - Device-Mapper Multipath Device Controller
     Loaded: loaded (/usr/lib/systemd/system/multipathd.service; enabled; vendor preset: enabled)
     Active: failed (Result: exit-code) since [...]
    Process: 51958 ExecStartPre=/sbin/modprobe dm-multipath (code=exited, status=1/FAILURE)    <-----
  
  Oct 20 06:48:56 testhost systemd[1]: Starting Device-Mapper Multipath Device Controller...
  Oct 20 06:48:56 testhost systemd[1]: multipathd.service: control process exited, code=exited status=1
  Oct 20 06:48:56 testhost systemd[1]: Failed to start Device-Mapper Multipath Device Controller.
  Oct 20 06:48:56 testhost systemd[1]: Unit multipathd.service entered failed state.
  Oct 20 06:48:56 testhost systemd[1]: multipathd.service failed.