Convert to switched FC backend

Hi,

Does anyone know of the least disruptive procedure to migrate from a non-switched (i.e. directly connected backend SAN) environment into a standard FC switched environment? This is for single engine VPLEX VS2 Metro configuration and Unity storage.

I currenty have 2 spare back-end ports free on each director and no-free ports on the storage and the process will need replicating at each site.

Any ideas appreciated - had a look thorough SolveOnline but didn't immediately find a suitable process.

Thanks

Gal