I should suggest that you open an case with Netapp and ask 
for a DataOntap upgrade plan. They can generate one for your specific 
system with all steps like firmare updates and so on included if 
needed.
 
If you are a premium support customer, you can even do it 
yourself.
 
Grtz,
Tom
we need to replace an older 900 series cluster with a new 3070 
cluster.  i want to make sure i dont miss anything or gotchas etc, looked 
on NOW but didnt find a complete guide or maybe i searched wrong.
we 
have 2 new 3070 heads and cables in the box and here is the current 
plan
1) shutdown and unmount storage nfs/iscsi
2) update to current 
ontap 7.2.4 (currently at 7.2.3)
3) reboot and allow shelf/disk firmware 
updates to complete
4) shutdown and remove 9XX heads and cabling
5) 
install 3070 heads, recable primary and secondary loops
6) power on heads, 
ensure licenses are current and installed and verify volumes
7) reload ontap 
with 3000 series architecture release 7.2.4
7) update rc file with new 
interface names
any major gaps in the above or comments from folks who 
have done this recently?
i went over this with the netapp tech rep and it 
seems pretty straightforward but always want peer review 
:)