If you want to seeding CCR Passive Storage group in Exchange 2007, you can use this method (easiest method that I found):
1) Go to EMC in passive node
2) Select Storage and click Update Storage Group
3) Click Next until process completed.
P/S : It’s depends on your size of EDB and log files.
Other alternative you can use Microsoft articles to better understanding about this process. You can read more here .