I wanted to find a good way to migrate from NFS old netapp to NFS new server (this one is not a netapp !).
why not just attaching disks directly? going from older nonsense to newer one :)
There 3 kind way (according to my own experience)- rsync old spool to new spool being patient stop services and then doing last rsync and mount /var/mailboxes mount point from old netapp to new nfs server).
right. this is the right way. last rsync should go quickly. well... not that quickly over NFS ;)