Migration of Netapp Filer in one geographic location whilst maintaining large snapmirror relationship with original destination.

I was upgrading a filer in one of our remote sites , part of the project called for the migration of our CIFS data , the CIFS volume contained over 1 TB of data and our link back to our Primary datacenter was 20Mbps. Snapping all of this data back down would have been a time consuming excersize
and needless waste of resources.

What follows are the high level steps i took to ensure that the new source filer replaced the old source filer in the snapmirror relation ship

Filer A = Old Regional Filer
Filer B = New Regional Filer
Filer C = Primary Datacentre Filer


1. Snapmirror relationship between FilerA(FilerAcifsvol1) already exists to FilerC(FilerAcifsvol1M)
2. Create Snapmirror relationship between FilerA(FilerAcifsvol1) and FilerB(FilerBcifsvol1)
3. Allow all Snapmirrors to become consistent
4. Change Snapmirror trigger to manual
5. Stop CIFS Service on FilerA
6. Perform final snapmirror in the following sequence
    FilerA(FilerAcifsvol1) ->FilerC(FilerAcifsvol1M)
    FilerA(FilerAcifsvol1) ->FilerB(FilerBcifsvol1)
   
Make sure that the correct snapshots exist on each filer
7. Quiesce and break  FilerA(FilerAcifsvol1) ->FilerB(FilerBcifsvol1) snapmirror relationship
8. Modify \\filerC\c$\etc\snapmirror.conf on FilerC as follows
    replace
   FilerA:FilerAcifsvol1 FilerC:FilerAcifsvol1M KBS=XXX ... ... ... ...
    With
  FilerB:FilerBcifsvol1 FilerC:FilerAcifsvol1M KBS=XXX ... ... ... ...

9. Putty  into filerC and execute the following command
   snapmirror update -S FilerB:FilerBcifsvol1 -w FilerC:FilerAcifsvol1M