DM-Multipath doesn't recover lost path after reconnecting

Issue

• When the storage side controllers are stopped, DM-Multipath looses access to the LUNs, "physically", and then the system deletes the sub paths (/dev/sdX devices) mapped to the multipath devices.

• Once the storage controller is up and running, still the removed sub paths could not discovered on the system even after rescanning the SCSI bus using steps in article - How do I rescan the SCSI bus to add or remove a SCSI device without rebooting the computer?

• After rescanning the scsi bus, /proc/scsi/scsi showing all the devices but fdisk -l does not list all the devices.

• After reboot system detect all the sub paths properly.