1) server_export server_2 [-Protocol {cifs|nfs}] -unexport [-perm] -all

as you can see, you can do that ..but is that what you really want to do ? Are ALL file systems being migrated at once ?

3) don't you need to specify what exports are presented to what hosts ? You could have some file systems exported to some hosts and some to other. You need to review existing export list and document the systems. You can put all exports into one file and copy and paste them, ie:

server_export server_2 -Protocol nfs -option rw=hostxyz, access=hostxyz, root=hostxyz /ufs1

server_export server_2 -Protocol nfs -option rw=hostabc, access=hostabc, root=hostabc /ufs2

you don't  need to mess with interconnects, you still need to them for replication from VNX to NS80

I am just curious to know I can clear up the replication session.

Thanks a lot Dynamox & Ernes for your time.

not sure what you mean by "clear up" ?

To remove the replication sessions and Interconnect setup.

that is assuming you want to break ALL replication relationship between VNX and NS80.