HP XP P9000 Continuous Access Synchronous for Mainframe Systems User Guide

If the original P-VOL is temporarily unavailable for update copy operations, suspend the new pair
so that the new main system keeps track of changes.
If you specify Only P-VOL for the CFW Data option, CFW data will not be migrated. Note that
there is a possibility that I/O will terminate abnormally if you access the corresponding data set
when you use S-VOL after migrating data.
Migration overview 73