Hi all,

I have a query regarding a head-swap upgrade which I've never
attempted before, so any help would be much appreciated!

We currently have a single-head FAS3020 running a small number of SATA
and FC shelves.  The head is EOL and so I've
been able to persuade my bean counters to buy me a pair of FAS3240
heads to use as an HA pair.  We're keeping all the
disk shelves, so I "just" need to swap the heads over.  From what I've
read, it's best practice to upgrade the old head to the
version of ONTAP that the new head will run, but we don't have that
option as the 3020 won't run ONTAP 8 and the 3240's
won't run ONTAP 7!  This is our central storage system, using CIFS,
NFS and LUNs over FC, so getting it wrong isn't really
an option.  Is this going to be achievable or should I call
professional services in?  I'd rather do this myself if possible, not
least because PS are rather expensive...  Can I just copy the latest
ONTAP onto the existing vol0 and shut the head down,
power up the new head and make the disks owned by the new head?  I
assume I'll also have to tell the FC switches about
the new WWPNs for the LUNs to work.  Will that work or will I end up
with a very large, very expensive brick?

Thanks!
Simon.
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