Ahh ok, so you are adding a new 6710 disk enclosure to a live 7200 system. Capacity growth is very common, and this process has been safely done 100s of times, but here in the USA, professional installation services are bundled with the new disk shelf.
The guide you linked is for initial configuration cabling before the system is powered on, and does not include the steps to hot-add a new shelf to a live system. I assume you are not inside the USA, your reseller/HPe Partner should have access to the non-disruptive installation procedure. Otherwise, I found this link to the official HPe forum:
https://community.hpe.com/t5/3PAR-Store ... CwYd1xKjuo