Migrations paths

I would like to write about my experiences integrating a NetApp FAS3050c system into our company network and storage practice, and migrating 10TB data from a slightly creaky fileserver running on FreeBSD 4.5 + Samba 2.2.2 -- but right now, I don't know where to start. The integration work is largely complete but I am still trying to complete the migration tools.

NetApp, OnTap 7.2.2, snapvault, cluster, NFS, CIFS, FTP, HTTP, rsync, NT4, /etc/passwd, /etc/group, md5, symlinks, change management, company communications ...