EMC VNX LUNs not detecting after system reboot

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Issue

EMC VNX storage LUNs not detecting after system reboot
After rescanning the SCSI bus using rescan-scsi-bus.sh the system detects all LUNs

Environment

Red Hat Enterprise Linux 5
kernel-2.6.18-308 and kernel-2.6.18-348.el5
Device-mapper Multipath
EMC VNX storage

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