I wrote a simple little perl script with automates the process of changing the serial numbers on the luns back to their pre-head upgrade serials, which you can find on the now site here:  http://communities.netapp.com/docs/DOC-2369

There is also a vb script one here: http://communities.netapp.com/docs/DOC-1754

which I basically imitated when making my perl version.

Romeo

On Thu, Oct 29, 2009 at 12:58 PM, Raj Patel <phigmov@gmail.com> wrote:
Hi all,

We're planning to upgrade our controller (a 270c to a 2050ha) - my
understanding is the iSCSI LUN's will retain their identity (ie the
existing IQN strings will remain the same) however we will probably
run into the ESX re-signaturing issue.

Is there a way to avoid this as part of the controller upgrade or do I
need to go into each connected ESX host and change the value of
LVM.EnableResignature to 1 ?

Are there any other potential 'gotchas' about an in-place head
replacement ? The process itself looks fairly straightforward if all
the steps are followed through in sequence.

Thanks in advance,
Raj.



--
Romeo Theriault
System Administrator
Information Technology Services