We recently rewired our SAN to provide for better redundancy, so that our pair of Brocade 5100s now each have access to both CX-4 SPs.

This will be hard to explain without a diagram.. but here goes..

Before, they didn't,Each 5100 went direct to one SP only: A-1 or B-1. Hosts on a Dell chassis had access to both SPs however via a pair of crosswired m5424s to the 5100s, such that their HBAs registered at the time saw both A-1 and B-1;  however, they did not see A-0 and B-0 as these were not connected at the time.

With the new wiring, all hosts use either port pair A-1 and B-0, OR pair  B-1 and A-0. 

But, for many of these HBAs, they're now registered to the old and new paths A-1, B-1, A-0, and B-0, but those connected via A-1 and B-0 are still registered with a dead path B-1 which they don't need, and likewise, those with B-1 and A-0 are still registered with A-1 too.

Is there a way to remove just those defunct paths without disruptively re-registering the entire HBA?

Thanks