Once you have copied in the intact p2 volume to your media drive, you use the log and transfer function in FCP to ingest them. This assumes 6.0.5 or later.
Shane Ross has this excellent video tutorial:
http://library.creativecow.net/articles/ross_shane/p2fcp6.php
Shane Ross has this excellent video tutorial:
http://library.creativecow.net/articles/ross_shane/p2fcp6.php