The PureApplication knowledge center documents how you can initiate a shutdown of your PureApplication System using the system console, by navigating to the System | System Settings page and clicking the “Shut down the system” link in the Power section:

Alternately, you can use the following statement in the PureApplication command-line interface to initiate a shutdown:

[ibmadmin@smoonen pure.cli]$ bin/pure -h 172.17.16.209
User name: smoonen
Password:
Welcome to the IBM PureApplication Software CLI.  Enter 'help' if you
need help getting started.
>>> admin.racks[0]._restattrs["target_state"] = "shutdown"
>>>