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In order to do this you must add the following to the bottom of /etc/inittab.
S1:2345:respawn:/sbin/agetty 115200 ttyS1 vt100
Then you must add ttyS1 to the bottom of /etc/securetty. If you don't you will not be able to log in as root from the serial console. So don't forget this step.
Then ssh into the ilo console — and run the following command.
</>hpiLO-> VSP
Note that this works on the ILO2, and possibly on the ILO3. It does not work on ILO1.