On filer..we did split into two.. default_ipspace ( Prod ) and dev_Ipspace ( dev/test )
so i created a vfiler assgined through default_ipspace, exported volumes to both prod and test servres.
prod servers -- successfully able to mount the volumes
test sevres -> cannot mount ( because vfiler is created in Prod ( default_ipspace ) and test serves are comming thorugh dev_ipspace )
so if test servers wanna come into Pord they need to come through firewall
and we don wanna open firewall ports for each and every test server which needs access to prod.
inorder to do that i merged both ipspaces on Filer and now i shared the volumes from the filer level which solved our issue.