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Multipathd occasionally fails to update the path status of DM-Multipath devices

Occasionally, multipathd does not update the path status of DM-Multipath devices after running I/O faults.

Set both HOTPLUG_USE_HWSCAN and HOTPLUG_USE_SUBFS to no in the /etc/sysconfig/hotplug file.

Multipathd fails occasionally because it fails to start "event checker" for some of the DM-Multipath devices. Because of this failure, multipathd is unable to keep track of the path up or down status for those devices.