Reset the MBR using Linux

Here is a simple trick if you need to clean it. Recently I needed to clean some Rocks Clusters node’s HD to allow it to reinstall

dd if=/dev/zero of=/dev/HD count=1 bs=512

This avoid the computer to try to boot from the hard drive. However, if the node was already on the cluster, you need to run

# insert-ethers --remove="compute-0-1"

To remove it from the cluster, where “compute-0-1″ is the name of the node in cluster. Then, you can start insert-ethers, and boot the node and it will start reinstalling itself.