This problem becomes more evident/likely if the fix/work-around for bug 1431650 is applied (i.e., no udev time-out for multipath devices).
It seems that the time-out that arises from that bug gives the SCSI scan time to complete, and by the time the last 'multipath' command runs (local-top/multipath), the SCSI disks from FC storage are already detected and in place.
FYI
This problem becomes more evident/likely if the fix/work-around for bug 1431650 is applied (i.e., no udev time-out for multipath devices).
It seems that the time-out that arises from that bug gives the SCSI scan time to complete, and by the time the last 'multipath' command runs (local- top/multipath) , the SCSI disks from FC storage are already detected and in place.