After performing yum update of system, machine has kernel panic after reboot reporting it is unable to locate root. Investigation found that initramfs-2.6.32.504.el6.i686.img was MISSING from the /boot partition and that the corresponding directive was also missing from grub.conf. Reinstallation of the kernel rpm using yum did NOT repair the situation. Needed to use dracut -f to build initramfs-2.6.32.504.el6.i686.img which also corrected grub.conf.
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