Thanks for the reply.
The process for SnapVault is slightly different to the one in the article:
- Update SnapVault between A -> C
- Break SnapVault between A -> C (stop further updates)
- Update the SnapMirror relationships A -> B (transferring the SV baseline snap)
- Break the snapmirror relationship between A -> B
- Delete the SV relationship between A -> C (you don't seem to be able to set up a second SV relationship on the destination vol)
- Create the SV relationship between B -> C
- Resync the SV relationship between B -> C
Cheers