RHEL8 cannot setup a non-lvm root directory lun over Multipath.

Solution Verified - Updated -

Issue

A SAN based root directory Lun, which is not using LVM2, fails to setup over multipath. All other Luns are multipathed.
/var/logs reports messages like the following

kernel: device-mapper: table: 253:0: multipath: error getting device
multipathd[2065]: 360014050b78c30daa8c4a09b9f0af6a8: removing map
multipathd[2065]: 360014050b78c30daa8c4a09b9f0af6a8: removing map
kernel: device-mapper: table: 253:0: multipath: error getting device
multipathd[2065]: 360014050b78c30daa8c4a09b9f0af6a8 devmap removed
multipathd[2065]: dm-0: devmap not registered, can't remove

Environment

  • RedHat Linux 8

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