df output does not show multipath friendly names after reboot

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Issue

After reboot df output is showing WWID of the LUN instead of mpathXX name:

/dev/mapper/3600508b400106d4c0000900001480000p1     774090496    479972 773531884   1% /export/r5_vol01

Environment

Red Hat Enterprise Linux
device-mapper-multipath

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