start /SYS --> starts the machine
start /SP/console --> starts the system console
These are ILOM commands. i believe you are using a blade server.
if your blade server is in poweroff state start /SYS will power on the server. so once you are hardware is powered on if you want to take a console of your machine then you need to give start /SP/console
Oracle has lot of documentations for your queries.
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