Steps to rectify the Corrupted MBR on RHEL 5 & 6

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Restore MBR in Linux


Boot into the Rescue mode.
boot:linux rescue
Select language, keyboard and skip finding the installation
Make a temporary mount point /vxvm and mount the root partition on it.
mkdir /vxvm
mount -t ext3 /dev/sda1 /vxvm [ where /dev/sda1 is the root partition ]
If the disk has a separate boot partition mount it on /vxvm/boot
mount -t ext3 /dev/sda2 /vxvm/boot [where /dev/sda2 is the boot partition]
Recreate the master boot record (MBR) on the root disk.
For the GRUB boot loader :
Check contents of /boot/grub/menu.lst or /boot/grub/grub.conf or /etc/grub.conf are correct
Use the /vxvm/sbin/grub command to enter into the grub menu to recreate the MBR on the disk
# /vxvm/sbin/grub
grub> root (hd0,1)
grub> setup (hd0)
grub> quit

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