We have a clustered environment with 2 nodes and shared SAN storage. In order to offload our SAN storage, we were thinking about adding a new solid state drive in each node that would have the same Drive letter ( eg. G:) and move the tempdb and a user db to this drive. The user db storages only transition data so we don't mind if we loose the data if we need to fail over.
For tempdb I believe there is no problem, since it's recreated everytime the SQL Server service starts. How about the user db?