Service Pack Roll: Users Guide: 
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To add the the Service Pack Roll to the nodes of your cluster, you'll need to reinstall the nodes.
To reinstall all your nodes, as root execute:
# rocks run host '/boot/kickstart/cluster-kickstart-pxe' |
 | It is critical that you run cluster-kickstart-pxe as it will force the compute nodes to PXE boot. It is important that you PXE boot the nodes for the first install, because with a PXE boot based install, the nodes with get their initrd from the frontend and inside the initrd is a new tracker-client that is compatible with the new tracker-server. After the first install, a new initrd will be on the hard disk of the installed nodes and then it is safe to run /boot/kickstart/cluster-kickstart. |