Shutting down the Clariion backend when Celerra does not work.

I am between a rock and a hard place here and I hope some experts can help me. I am pretty new to the Celerra environment. We have a Celerra NX4 that has the Celerra modules still physically plugged into the SAN system but are inoperable. The services will not start. A previous administrator made it unfunctionable. EMC has said in order to get it working again they need to come out and reinstall from scratch. We are waiting for the quote for that service.

Right now we are using the Clariion back-end just fine even though the Celerra portion will not start. We need to shutdown the SAN because of a power outage to the building. We cannot access the Celerra potion obviously to shut it down according to documented procedures. What can we do to bring down the back-end properly without data loss.

Could I turn off all hosts accessing the system, turn off one of the SP's, wait 5 minutes for the write cache to flush, turn off the other SP and then power off the drives?

We have tried to go through proper channels here to try and get EMC out here to remove the Celerra portion from the system completely but now we are out of time before that can be done. What can I do to safely shut down the Clariion back-end?

Thanks for any help.